OAuth 2 and Doorkeeper
Resource Owner Password Credentials Flow
Rest Api
Merge branch 'Rest-Api' of https://github.com/rda1902/stackoverflow into Rest-Api

Conflicts:
	app/controllers/api/questions_controller.rb
Preparing to rest api tests
Some test for rest api
Profiles rest api
rest api
rest api
Question api: file upload
Merge branch 'Rest-Api'