Back to two grid classes, .col and .col-lg-*
Fix navbar-toggle after commit bbee78b30b40ff0b1473a06ea7ecf5a42d51b614

The following commit introduced an issue with the navbar toggle placement:
https://github.com/twitter/bootstrap/commit/bbee78b30b40ff0b1473a06ea7ecf5a42d51b614
Merge pull request #7716 from burnsra/3.0.0-wip-navbar

Fix navbar-toggle after commit bbee78b30b40ff0b1473a06ea7ecf5a42d51b614
Merge pull request #7704 from twitter/bs3_moar_grid_changes

BS3: Overhaul grid system once more
Use @font-size-... variables instead of hardcoded font-size in px