Added API version to the client
New Source API support
Added support for the 201 Created HTTP code
adds Historic preview support & example as well as managed sources examples
make API version configurable
Added functionality for the source and resource Add/Remove end points and updated the managed sources example to use the new end points
Added functionality for auth and resource Add/Remove end points. Managed source example has also been updated to use these new methods.
Merge pull request #31 from datasift/feature/sourceRemoveAdd

Feature/source remove add
Added logs for managed sources. Added pull functionality for subscriptions but ApiClient still needs to be changed to handle the new line JSON response from pull
Completed the pull example, the API client can now handle new line delimited JSON
Added Historics/pause and Historics/resume.
Fixed some broken meethods in DataSift_Push_Subscription.

Wrote a new example of how to load and reload subscriptions.
Merge pull request #32 from datasift/feature/newFeatures

Feature/new features
Update README.md
Merge branch 'develop' into 2.1.8

Conflicts:
	.gitignore
	README.md
Merge branch '2.1.8' into develop