Allow posting to the board through OAuth
Allow revoking application access grants from user preferences
Since access grants are now easily revokable by users, extend their lifetime to one year, and fix prune! method
Fix rake elasticsearch:import
Update doc
Use doorkeeper for OAuth2
Let users revoke authorized applications
Admin can show all the applications
Customize the views for doorkeeper
Use OAuth2 scopes for API
Update developer doc
Update developer doc with scopes
Update a bunch of gems
Skip CSRF check when posting through the OAuth api