changed Procfile to declare "web" - needed for dokku deploymnents
configure production database via environment. better for dokku deployments.
Merge pull request #10 from tubit/master

Changed Procfile target and database connections
Fix discovery JSON

The image should always link to <domain>/user.jpg.
Change bundled database.yml to use DATABASE_URL in production. (closes #11)
Only ask for branch to deploy if current branch is not master.
Track remote followers. (#13)

* Adds `User#remote?`, reverse of `User#hosted?`
* `UserFetcher` now never fetches remote users.
* Adds `FriendshipChecker` and `RelFollowingChecker` service classes.
* Makes `WebmentionHandler` defer to `RelFollowingChecker` if target is user's homepage.
* Simplify `Webmentioner`.
* Lists known followers (including remote) on "Following" page.
* Periodically runs `FriendshipChecker`, which checks for a rel-following for remote friendships every 6 hours or so.
Fix handling of extra markup for user partial
Display number of followers
Merge remote-tracking branch 'hmans/master'

Conflicts:
	config/database.yml