Keeping an eye on PHP 5.6

PHP 5.6 still alpha, but we can check if our code will break over there. Seems we have one incompatible thing so far. :)
Merge pull request #180 from malukenho/patch-1

Keeping an eye on PHP 5.6
Updated Respect\Foundation
hhvm RecursiveTreeIterator support

This code is from the PHP source itself. It's required to run
Respect\Validation on hhvm, which lacks the class.

By adding it to the library folder, it's loaded automatically
by our testing routines.

Further documentation should be written, but only after a stable
build for hhvm appears on Travis.
PHP 5.6 working, hhvm on testing
Merge pull request #2 from Respect/master

merge