Create firebaseLibAuth.php

This adds Authentication to the firebaseLib.php
Update firebaseTest.php

This now has the Auth ability
Update firebaseLibAuth.php

Added POST and PATCH requests which is the Javascript equivalent to 
a push() and an update(). So I called the functions exactly that.
Update firebaseLibAuth.php

added getObj() method which returns the firebase as a std PHP Object instead of a json Object.
Merge pull request #2 from craigrusso/master

I'll merge it for you manually.