* Add check for missing tag param in streaming API

Fixes error:

```
TypeError: Cannot read property 'toLowerCase' of undefined
at app.get (.../streaming/index.js:493:50)
```

* Fix code style issues

Regression from #8951

* Do not push DMs into the home feed

* Show DMs column after sending a DM, if DMs column is not already shown

Mention and emoji code may perform network calls, but does not need
to do that inside the database transaction. This may improve availability
of database connections when using pgBouncer in transaction mode.

Bumps [better_errors](https://github.com/BetterErrors/better_errors) from 2.4.0 to 2.5.0.
- [Release notes](https://github.com/BetterErrors/better_errors/releases)
- [Changelog](https://github.com/BetterErrors/better_errors/blob/master/CHANGELOG.md)
- [Commits](https://github.com/BetterErrors/better_errors/compare/v2.4.0...v2.5.0)

Signed-off-by: dependabot[bot] <support@dependabot.com>

Bumps [bullet](https://github.com/flyerhzm/bullet) from 5.7.5 to 5.7.6.
- [Release notes](https://github.com/flyerhzm/bullet/releases)
- [Changelog](https://github.com/flyerhzm/bullet/blob/master/CHANGELOG.md)
- [Commits](https://github.com/flyerhzm/bullet/compare/5.7.5...5.7.6)

Signed-off-by: dependabot[bot] <support@dependabot.com>

Bumps [scss_lint](https://github.com/brigade/scss-lint) from 0.57.0 to 0.57.1.
- [Release notes](https://github.com/brigade/scss-lint/releases)
- [Changelog](https://github.com/brigade/scss-lint/blob/master/CHANGELOG.md)
- [Commits](https://github.com/brigade/scss-lint/compare/v0.57.0...v0.57.1)

Signed-off-by: dependabot[bot] <support@dependabot.com>

Fix #8685

Bumps [capistrano-rails](https://github.com/capistrano/rails) from 1.3.1 to 1.4.0.
- [Release notes](https://github.com/capistrano/rails/releases)
- [Changelog](https://github.com/capistrano/rails/blob/master/CHANGELOG.md)
- [Commits](https://github.com/capistrano/rails/compare/v1.3.1...v1.4.0)

Signed-off-by: dependabot[bot] <support@dependabot.com>

Bumps [dotenv-rails](https://github.com/bkeepers/dotenv) from 2.2.2 to 2.5.0.
- [Release notes](https://github.com/bkeepers/dotenv/releases)
- [Changelog](https://github.com/bkeepers/dotenv/blob/master/Changelog.md)
- [Commits](https://github.com/bkeepers/dotenv/compare/v2.2.2...v2.5.0)

Signed-off-by: dependabot[bot] <support@dependabot.com>

Bumps [faker](https://github.com/stympy/faker) from 1.8.7 to 1.9.1.
- [Release notes](https://github.com/stympy/faker/releases)
- [Changelog](https://github.com/stympy/faker/blob/master/CHANGELOG.md)
- [Commits](https://github.com/stympy/faker/compare/v1.8.7...v1.9.1)

Signed-off-by: dependabot[bot] <support@dependabot.com>

Bumps [memory_profiler](https://github.com/SamSaffron/memory_profiler) from 0.9.11 to 0.9.12.
- [Release notes](https://github.com/SamSaffron/memory_profiler/releases)
- [Changelog](https://github.com/SamSaffron/memory_profiler/blob/master/CHANGELOG.md)
- [Commits](https://github.com/SamSaffron/memory_profiler/compare/v0.9.11...v0.9.12)

Signed-off-by: dependabot[bot] <support@dependabot.com>

* add ffmpeg initializer

* use different expression to check for environment var

Bumps [capybara](https://github.com/teamcapybara/capybara) from 3.8.2 to 3.9.0.
- [Release notes](https://github.com/teamcapybara/capybara/releases)
- [Changelog](https://github.com/teamcapybara/capybara/blob/master/History.md)
- [Commits](https://github.com/teamcapybara/capybara/compare/3.8.2...3.9.0)

Signed-off-by: dependabot[bot] <support@dependabot.com>

Bumps [tty-prompt](https://github.com/piotrmurach/tty-prompt) from 0.17.0 to 0.17.1.
- [Release notes](https://github.com/piotrmurach/tty-prompt/releases)
- [Changelog](https://github.com/piotrmurach/tty-prompt/blob/master/CHANGELOG.md)
- [Commits](https://github.com/piotrmurach/tty-prompt/compare/v0.17.0...v0.17.1)

Signed-off-by: dependabot[bot] <support@dependabot.com>

Bumps [aws-sdk-s3](https://github.com/aws/aws-sdk-ruby) from 1.20.0 to 1.21.0.
- [Release notes](https://github.com/aws/aws-sdk-ruby/releases)
- [Changelog](https://github.com/aws/aws-sdk-ruby/blob/master/gems/aws-sdk-s3/CHANGELOG.md)
- [Commits](https://github.com/aws/aws-sdk-ruby/commits)

Signed-off-by: dependabot[bot] <support@dependabot.com>

Bumps [i18n-tasks](https://github.com/glebm/i18n-tasks) from 0.9.21 to 0.9.25.
- [Release notes](https://github.com/glebm/i18n-tasks/releases)
- [Changelog](https://github.com/glebm/i18n-tasks/blob/master/CHANGES.md)
- [Commits](https://github.com/glebm/i18n-tasks/compare/v0.9.21...v0.9.25)

Signed-off-by: dependabot[bot] <support@dependabot.com>

* cleanup pass

* undo mistakes

* fixed.

* revert

SignatureVerification#matches_time_window? is not called anywhere.

* Add conversations API

* Add web UI for conversations

* Add test for conversations API

* Add tests for ConversationAccount

* Improve web UI

* Rename ConversationAccount to AccountConversation

* Remove conversations on block and mute

* Change last_status_id to be a denormalization of status_ids

* Add optimistic locking

POST /api/v1/notifications/dismiss was a mistake in #2251

Fix #8590

Signed-off-by: Marcin Mikołajczak <me@m4sk.in>

* Change documentation URL

* Fix hardcoded documentation URL in locales

* Remove unused ruby-progressbar dependency

* Remove unused colorize dependency

* RTL: fix margins of public-account-header__tabs

* fix style

* even more stylish code :)

* Force use language detector if account is remote

* Set unknown remote toot's language as nil

Bumps [omniauth-saml](https://github.com/omniauth/omniauth-saml) from 1.10.0 to 1.10.1.
- [Release notes](https://github.com/omniauth/omniauth-saml/releases)
- [Changelog](https://github.com/omniauth/omniauth-saml/blob/master/CHANGELOG.md)
- [Commits](https://github.com/omniauth/omniauth-saml/compare/v1.10.0...v1.10.1)

Signed-off-by: dependabot[bot] <support@dependabot.com>

Bumps [parallel_tests](https://github.com/grosser/parallel_tests) from 2.21.3 to 2.23.0.
- [Release notes](https://github.com/grosser/parallel_tests/releases)
- [Commits](https://github.com/grosser/parallel_tests/compare/v2.21.3...v2.23.0)

Signed-off-by: dependabot[bot] <support@dependabot.com>

Bumps [puma](https://github.com/puma/puma) from 3.11.4 to 3.12.0.
- [Release notes](https://github.com/puma/puma/releases)
- [Changelog](https://github.com/puma/puma/blob/master/History.md)
- [Commits](https://github.com/puma/puma/compare/v3.11.4...v3.12.0)

Signed-off-by: dependabot[bot] <support@dependabot.com>

* Add a confirmation dialog when hitting reply and the compose box isn't empty

Fixes #878

* Performance improvement

Bumps [nokogiri](https://github.com/sparklemotion/nokogiri) from 1.8.4 to 1.8.5. **This update includes security fixes.**
- [Release notes](https://github.com/sparklemotion/nokogiri/releases)
- [Changelog](https://github.com/sparklemotion/nokogiri/blob/master/CHANGELOG.md)
- [Commits](https://github.com/sparklemotion/nokogiri/compare/v1.8.4...v1.8.5)

Signed-off-by: dependabot[bot] <support@dependabot.com>

* Code quality pass

* Typofix

* Update applications_controller_spec.rb

* Update applications_controller_spec.rb

Configurable soft limit of 7,500, and above that, configurable
ratio of 1.1 * followers, controlled by:

- MAX_FOLLOWS_THRESHOLD
- MAX_FOLLOWS_RATIO

Fix #2311

Bumps [fog-openstack](https://github.com/fog/fog-openstack), [rspec-rails](https://github.com/rspec/rspec-rails) and [fog-core](https://github.com/fog/fog-core). These dependencies needed to be updated together.

Updates `fog-openstack` from 0.3.6 to 1.0.3
- [Release notes](https://github.com/fog/fog-openstack/releases)
- [Changelog](https://github.com/fog/fog-openstack/blob/master/CHANGELOG.md)
- [Commits](https://github.com/fog/fog-openstack/compare/v0.3.6...v1.0.3)

Updates `rspec-rails` from 3.7.2 to 3.8.0
- [Release notes](https://github.com/rspec/rspec-rails/releases)
- [Changelog](https://github.com/rspec/rspec-rails/blob/master/Changelog.md)
- [Commits](https://github.com/rspec/rspec-rails/compare/v3.7.2...v3.8.0)

Updates `fog-core` from 1.45.0 to 2.1.2
- [Release notes](https://github.com/fog/fog-core/releases)
- [Changelog](https://github.com/fog/fog-core/blob/master/changelog.md)
- [Commits](https://github.com/fog/fog-core/compare/v1.45.0...v2.1.2)

Signed-off-by: dependabot[bot] <support@dependabot.com>

Bumps [webmock](https://github.com/bblimke/webmock) from 3.3.0 to 3.4.2.
- [Release notes](https://github.com/bblimke/webmock/releases)
- [Changelog](https://github.com/bblimke/webmock/blob/master/CHANGELOG.md)
- [Commits](https://github.com/bblimke/webmock/compare/v3.3.0...v3.4.2)

Signed-off-by: dependabot[bot] <support@dependabot.com>