nuke the .col
fix docs highlighting of grid
reverse order of grid column examples for dual grid section
Another grid update

* Update docs to include table of grid levels and behaviors
* Change from .col-md to .col-sm to match existing size variables we use elsewhere
* Keep .col-lg as-is though for simplicity as we won't likely add a fourth level of the grid
* Combine responsive .container breakpoints with grid breakpoints in grid.less
* Other misc docs updates
add new grid subnav link
Redo grid documentation

* Update example sections to include basic, mobile-desktop, and mobile-tablet-desktop implementations
* Add more examples to the grid example page
* Red columns instead of gray for more Bootstrapy aesthetic
No more need for grid column highlighting, so nuke that
Update docs JS to prevent clicks on links with hash hrefs
Merge branch '3.0.0-wip' of github.com:twitter/bootstrap into 3.0.0-wip
Merge pull request #3 from twitter/3.0.0-wip

Pulling commits from Bootstrap's 3.0.0 wip