Changed readme badges to use official sources.
Changed readme badges to use official sources.

As soon as I switched to the shields.io badges the gemnasium support
broke. Might want to revisit the idea in the future.

stevenbenner/jquery-powertip,jasco/jquery-powertip,erthalion/jquery-powertip,erthalion/jquery-powertip,jasco/jquery-powertip,stevenbenner/jquery-powertip