Resolved most graphical bugs (?) with latest versions of Chosen/Boostrap/FontAwesome

There appears to be a lingering graphical bug with multiple and the focus highlight's bottom border radius (square instead of round).
Did not add RTL or Retina groups from latest Chosen.
Did not try to optimize merged CSS using Bootstrap LESS.
Tested with single and multiple only.

This PR is in regard to #5.

Tested against:
Chosen 0.9.14
Bootstrap 2.3.1 (yes I realize there is 2.3.2)
FontAwesome 3.1.1