Implements drag and drop upload in creating issues
Deletes pry.
Merge branch 'issue_file_upload' of https://github.com/erbunao/gitlabhq into issue_file_upload

* 'issue_file_upload' of https://github.com/erbunao/gitlabhq:
  Deletes language spec
  Removes debugging codes.
  Refactors backend.
  wrong implementation.
  Implements error handling on invalid file types.
  Fixs for UI
  Integrates ui to backend.
  Backend integration
  UI Layout and JS implementation
  Shows image url in the text box.
  Initiazes file upload.
  WIP: Drag and drop attachment
  Upload a file to an issue + feature tests
Removes pry