Added support for four new Managed Sources API endpoints to improve usability
Added new Managed Sources endpoints to MS example
Ensure all POST and PUT API requests are sent JSON encoded with correct headers
Bump to v.3.1.0
Added support for "validate" param to allow users to choose not to validate their resources of tokens + changes source add & remove requests from POST to PUT
Merge pull request #60 from datasift/feature/source-add-remove

Add Managed Sources /add and /remove endpoints