Rebased: 13_Api

 #13: Implemented token-based authentication API base

 #13: Restricting projects API show to only users who have
permission to view a project

 #13: Projects can now be deleted and updated through the API

 #13: Added rate limiting to the V1 API and tickets_controller

 #13: Implement v2 of the API,
renaming name to title for projects
Merge pull request #3 from MavkaPoltavka/13_designing_an_api

Rebased: 13_Api