remove unnecessary API::VERSION constant

Refactored profile to resource. Added missing flash notice on successfull updated. Update username via ajax

refactor flash

commit diff - check if prev_commit is not nil

remove length limit from notes

* make unobtrusive js
* convert js to coffee

  * fixed in grape v0.2.2

Rewording for the account being blocked

bugfix: backup data retrieved with the same type keys as saved

issue #2118: fix undefined method  for nil:NilClass exception

API: don't expose 'updated_at' for notes

Notes API