promote angular dependencies to ~1.2.9

The bower.json file locked the angular dependencies to 1.2.3.
I've updated it to 1.2.9 or above ( as the latest angular version downloadable with bower is 1.2.10 )

Don't know if you wish to pull this, but as I performed the update I thought that would be handy not only for me!

Thanks for your work,
cheers
Edoardo