Release v2.1.0-beta1
Merge branch 'master' into 2.1-merge # Conflicts: # src/guzzle/src/CoroutineHandler.php # src/guzzle/tests/Stub/CoroutineHandlerStub.php
Merge branch 'master' into 2.1-merge # Conflicts: # src/guzzle/src/CoroutineHandler.php # src/guzzle/tests/Stub/CoroutineHandlerStub.php