Add follow notifications.

See merge request !92

User card content visual bugfixes

See merge request !91

This reverts commit 86773579.

Fix long names overflowing and messing everything (now just overflowing parts not drawn), fix non-square avatars not drawn as squares.

Add a registration form.

See merge request !76

Feature/slicker buttons

See merge request !90

Add a config.json option for enabling registration, don't link and redirect away from register page when it's disabled.

Feature/completion

See merge request !66

Clicking autocomplete will return focus to text area, make the autocomplete box disappear after clicking on a name.