tests: added latte tests
classes DateTime and ArrayHash moved to Nette\Utils namespace.
Framework uses Latte instead of Nette\Latte
added testing support files
added composer.json
added bower.json
added readme.md
Revert "netteForms: added mime type validation" - has problem with Firefox https://bugzilla.mozilla.org/show_bug.cgi?id=373621

This reverts commit 21cbd157269475064757345a60b816407d343ac5.