Upgrade PHP 5.5 to 5.5.15
Move abstract classes out of Formula directory
Remove obsolete hacks

Closes #1255.
Revert "Remove obsolete hacks"

This reverts commit b3e793f0860286669c4be2934a1e71c6fb717d2c.
Revert "Move abstract classes out of Formula directory"

This reverts commit c56eeff11f80bfe6d919558c2eec50832d1d2bb4.
Upgrade PHP 5.4 to 5.4.31
Upgrade PHP 5.6 to RC3