Refactored Curl to use __CallStatic instead.
Fixed some issues with POST/PUT data.
Response should now correctly parse headers and content.
Added support for headers in Session.
The helper class is now fully tested.
Removed destructors from Dispatcher and Session.
SessionTests should use httpbin.org aswell.
Renamed testAddMultiHandleWithError to testAddMultiWithInvalidHandle.
HeaderBag should use SessionInterface.
Added tests for HeaderBag.
Updated changelog to reflect recent changes.
Bumped version to 2.0.0-RC1.
Updated composer file with docs url.