Updated phpdoc to be more precise about return values
Fixed the debug command for Symfony 2.4+

This backports the fixes done by @ClementGautier in the 2.0 version of
the bundle.
Closes #127
Merge branch '1.x'

Conflicts:
	Command/RouterDebugExposedCommand.php
	Extractor/ExposedRoutesExtractorInterface.php
	Tests/Controller/ControllerTest.php