add ability to open status by URL from search (fix #53)

Returns accounts, statuses, hashtags arrays

adjusted to allow choosing it, yet

(Because postgres can tell that count(*) needs no extra checks, but
counting a specific column requires them)

Fix anchor tags in some wikipedia URLs being matches as a hashtag

Redirect /:username to /users/:username
Redirect /:username/:id to /users/:username/updates/:id
Updated API documentation and sponsors

before. In the API, attachments now can be either image, video or gifv. Gifv
is to be treated like images in terms of behaviour, but are videos by file
type.

Add ability to search accounts by display name

"whole known network" which is what public timeline used to be

Only domain blocks with suspend severity will block PuSH subscriptions
Silenced accounts should not appear in conversations unless followed

StreamEntry model. Simply render Salmon slaps as they are needed

Allow PuSH to distribute private toots with that condition

status is not in the system at time of distribution; fix #607 - reset privacy
settings to defaults when cancelling replies

to only those from local users; Add link to "extended information" to
getting started in the UI; Add defaults for posting privacy; Change
how publish button looks depending on posting privacy chosen

Try to fix Travis CI setup

redis-backed "mentions" timeline as redundant (given notifications)