Add jquery.caroufredsel 6.1.0

jQuery.carouFredSel is a plugin that turns any kind of HTML element into
a carousel. It can scroll one or multiple items simultaneously,
horizontal or vertical, infinite and circular, automatically or by user
interaction. Oh, and it's responsive too.

Homepage: http://caroufredsel.dev7studios.com/
License: MIT / GPL
Added string.js 1.2.0
Minified string.js.
Update backbone.js to v0.9.10
Merge pull request #781 from degorov/master

Update backbone.js to v0.9.10
Merge pull request #780 from jprichardson/master

Added string.js library. [version 1.2.0]
Merge pull request #746 from xrmx/carouFredSel

Add jquery.caroufredsel 6.1.0