Clean up PHPCS Suggestions
Update version requires in composer.json for easier maintenance.
Start converting registry usage to an array.
Massive round of cleanup
Add docs to Github; light refactoring; bug fixes.

* Rename `Package` and `GithubObject` classes to `AbstractPackage` and
`AbstractGithubObject` respectively.
* Deprecated `Package` and `GithubObject` classes.
* Fix bug in create tag API.
* Fix bug in `Teams::chekRepo` API (missing repo owner name - this is
technically not backward compatible, but the old method would not
anyway)
* Added support for releases.
* Added more examples to documentation.
Fix merge conflict.
Fix response of getRateLimit for enterprise servers

Github Enterprise allows for unlimited rates. If so, the limit will
return false.
Use the processResponse() method of the parent class.
Add missing unit tests
Merge pull request #304 from eddieajau/Github2

Fix response of getRateLimit for enterprise servers
Tagging 1.1.0