Sketch of auth with dropbox
New dropbox app
Dropbox auth url is provided via authService from server
- Controller for management  cloudServices
- Simple ui, add/unlink
- delete service
- user data update on
- implemented authentication with GDrive
- updated cloudService adding/unlink functionality
- added sign in for gdrive
Added arrow pointer for add/unlink service
Fix for a pointer, some methods of CloudServiceCtrl are made private
Metadata displaying fix
Merge remote-tracking branch 'remotes/origin/4_managing_cloud_services'

Conflicts:
	app/index.html
	app/partials/aside.html
	app/scripts/directives/initJplayer.js