Update to mockery 0.9.0 and add gulp deps.

Signed-off-by: crynobone <crynobone@gmail.com>
Add gulp and refactor code generation to use gulp

Signed-off-by: crynobone <crynobone@gmail.com>
Add PHP 5.6 and hhvm to travis-ci and remove .gitattributes from export

Signed-off-by: crynobone <crynobone@gmail.com>
Merge branch '2.1'

Signed-off-by: crynobone <crynobone@gmail.com>

Conflicts:
	.travis.yml
	composer.json