* Move ApiController to Api/BaseController

* API controllers inherit from Api::BaseController

* Add coverage for various error cases in api/base controller

* Coverage for rate limit headers

* Move rate limit headers methods to concern

* Move throttle check to condition on before_action

* Move match_data variable into method

* Move utc timestamp to separate method

* Move header setting into smaller methods

* specs cleanup

* Redirect to streaming_api_base_url

When Rails receives a request to streaming API, it most likely
means that there is another host which is configured to respond
to it. This is to redirect clients to that host if
`STREAMING_API_BASE_URL` is set as another host.

* Use the new Ruby 1.9 hash syntax

Remove protect_from_forgery in ApiController, which is disabled by the
following skip_before_action, as well.

* Keep ENV['LOCAL_HTTPS'] with ApplicationControllerSpec (fix random fail)

* use climate_control

* Add StreamEntryFinder class to parse URLs

* Use StreamEntryFinder and clean up api/oembed controller

* Remove methods from ObfuscateFilename

* Spec ObfuscateFilename

* Spec output of Settings::Exports::BlockedAccountsController

* Spec output of Settings::Exports::FollowingAccountsController

* Spec output of Settings::Exports::MutedAccountsController

* Spec Settings::Exports::BaseController

This commit removes duplicate specs in classes inheriting
Settings::Exports::BaseController as well.

* Set delete_modal preference to true by default
* Does not show confirmation modal if delete_modal is false
* Add ja translation for preference setting page

In single user mode, visitors are redirected to the single user's
profile page.  So, if you are the owner without a session, you start
from that page, click the login button and authenticate yourself
expecting you'll soon get started with the home page, but in reality
you'll get redirected back to where you started from -- your own
profile page.

This fixes the behavior by redirecting you home after login if you
have started from your own profile page.

(You may think that we need account deletions, but this way would've just orphaned the db records)

- Increase coverage to exercise all parts of each action
- Move into namespace to share common code
- Misc refactor of each action for smaller methods, simpler code