Remove support for PHP 5.3
README.md: Add OS support & mention PHP >= 5.4 compatibility
README.md: Add notes about PHP 5.3 on Debian and our repos
Merge pull request #44 from Mayflower/fix/remove_5.3_support

Remove support for PHP < 5.4 on Debian
Retarget dependency requirement from package parameter to package class
Merge pull request #48 from spacepants/fix/package_dependencies

Retarget dependency requirement from package parameter to package class
Install phpunit from the phar