First version of Select2 widget.

It works only in one theme file right now. Also it does not have a lot of "variables" in the less version. Uses the out of the box CSS contents in less structure for now.

TODO:
1. Better less file with more usage of mixins and variables.
2. Extending the widget to extra.html of all the 3 themes.
Merge branch 'less' of http://github.com/dharapvj/jquery-ui-bootstrap-less into less
Second version of Select2 widget.

Most of the browser specific code is now converted to use mixins.
Still to replace hardcoded values by variables so that look will change as per the theme.
Fixes #200.
Also contains text directory containing sample html to prove the same.