Merge pull request #5 from Dantemss/master

Implemented the API
Merge pull request #6 from Dantemss/master

Specs
Merge pull request #7 from Dantemss/master

Added travis and code climate badges
Merge pull request #8 from Dantemss/master

Allow applications to have multiple client credentials tokens
Merge pull request #9 from Dantemss/master

Fixed access policy for special input events
Merge pull request #10 from Dantemss/master

Task events, Message events and Grading events now actually server side;...
Merge pull request #11 from Dantemss/master

Added note to API calls about needing the identifier in the URL
Ruby version and gem update; removed redundant controller method