Updated lib paths

Updated jQuery to 1.9.1, changed underscore & backbone to CDN and
FacebookUser.js to a relative link
Fixed a small bug in the FacebookUser.js lib
hint for min backbone version
Merge branch 'master' of git://github.com/WouterDS/facebook-user.js into WouterDS-master

Conflicts:
	index.html
again fixes the params passed to success callback of sync