Added support for Laravel 4.2

I changed `Illuminate\View\Environment` to `Illuminate\View\Factory`, changed the variable name from `$environment` to `$factory` and bumped the Mockery dependency to ~0.9.0, cause PHPUnit 4.0 was throwing errors for 0.8. Because Laravel 4.2 is PHP 5.4 and up only I also removed the PHP 5.3 tests from .travis.yml.