3.4/develop

Fully embraced the composer way of doing things, added requirement of PHP 5.4+, and added some fancy new 5.4 stuff.
If it wasn't for the CFS, we wouldn't need to have `Kohana::modules` at all. Many modules could use PSR-0 autoloading via composer with minimal modifications. Of course, everything outside of `classes/` still matters, but some modules only contain code.