Skeleton for the rails api, ruby version to be used and git ignore list. Also including rspec for testing
 Adding required routes for the robots endpoint.
Using mongodb to store robot documents. Test driving the create scenario. Also including database cleaner for specs
create or update a robot by id. Return 400 for invalid robot details
Implementing index and show actions for robots controller
Refactoring the create_or_update to support for auditing. Also implementing the history action.
Adding index on the RobotAudit document for robot_id.