Add restriction on names

Closes #15

See merge request !15

Follow and unfollow using screen_name

See merge request !9

Doesn't really belong there, find a different place for it. Should
federate on every activity insertion.

Merge branch 'develop' of ssh.gitgud.io:lambadalambda/pleroma into feature/follow-unfollow-by-screen-name

Mentions timeline bugfix

See merge request !11

Add statuses/mentions endpoint

Closes #2

See merge request !10

Merge branch 'feature/unfollow-by-screen-name' of ssh.gitgud.io:dtluna/pleroma into feature/follow-unfollow-by-screen-name

Merge branch 'feature/follow-by-screen-name' of ssh.gitgud.io:dtluna/pleroma into feature/follow-unfollow-by-screen-name

Feature/user timeline

See merge request !8