Add Bootstrap, commit 644c227
Add dotless

Note that this is a custom version of dotless, made to support the
syntax used in Bootstrap. This specifically means semicolons instead
of commas as argument separators for mixins.

Unfortunately Bootstrap cannot yet be compiled using dotless due to
a StackOverflowException when a class contains a call to a mixin
with the same name as the class.
Ugly fix to avoid stack overflows in dotless
Another ugly hack to make dotless happy