Bumping PHP and ZF2 dependencies, branch alias for master
Adding release notes for the PHP and ZF2 deps bump
Adding HHVM to the build matrix - 5.5 not allowed to fail anymore
Adding scrutinizer-ci config, higher coverage pass ratio
Scrutinizer needs dev dependencies to run correctly
Typo fix
Excluding HHVM from coverage, excluding 5.3 from PHPCS
Adding code quality badges
Merge pull request #376 from doctrine/hotfix/php-5.3.3-drop

[WIP] Bumping PHP and ZF2 dependencies, branch alias for master