Initial Release for CakePHP 3.0

Some might know Tiny Auth from CakePHP 2.x as part of the Tools plugin.
After 6+ years it has now owned a place as standalone plugin.

See the sandbox @ http://sandbox3.dereuromark.de/auth-sandbox for a live demo.

A huge thx to @bravo-kernel as he helped a great deal to upgrade it to 3.x and provided an incredible 94% test coverage.