Added Swig - A templating engine for browsers, similar to Django, Jinja2, and Twig

This pull request only includes the browser library for Swig, not the server side Node.js code. The browser library can be used as a templating engine on its own, it is not dependant on the server side.

Source was from:
http://paularmstrong.github.io/swig/
http://paularmstrong.github.io/swig/js/swig.min.js

Source can also be found at:
https://github.com/paularmstrong/swig/releases
https://github.com/paularmstrong/swig/releases/download/v1.3.2/swig.min.js

Currently has 63 Watchers and 1,052 Stars
![screen shot 2014-03-12 at 11 13 59](https://f.cloud.github.com/assets/1736858/2396334/8300cdf2-a9d7-11e3-84d8-7253e92626d7.png)