Remove 418 'I'm a teapot' status code
Remove 425 'Reserved for WebDAV advanced collections expired proposal' status code
PHP 5.4 short arrays in ReasonPhrase class
Response::canHaveBody now returns false when the status code set is 205
Fix failing test because status code 425 was removed
Create AbstractMultipleValueHeader to remove code duplication
Add methods for setting date headers with integer timestamps in Response class
Use setDateWithTimestamp method in Response::__construct
Add methods for setting date headers with DateTime objects in Response class
Oops.. adding unit tests for the last commit
Refactor HttpDateMock