Fully encapsulate bootstrap

Bootstrap 2.3.1 is a virgin clone in the /lib/bootstrap folder.
The intranet's root less file (/less/intranet.less) is a "fork" of
bootstrap.less
The intranet uses a "fork" of the bootstrap variables.less
(/less/variables.less)

This approach has several benefits:
* Updating bootstrap is simple as %git pull /lib/bootstrap
* Merging in future versions of bootstrap only touches two files.
* The overall CSS is leaner because it's not including the entire
bootstrap project