add customizer link to docs homepage
Cleanup .navbar-form styles

* Nuke the commented out navbar forms code that's not currently needed
* Add a few more examples to the .navbar-form docs section
* Remove (for now at least) top padding on checkbox and radios
delete lingering navbar dividers code since we nuked that awhile back
Improve buttons in navbars

* Add top margin, calculated by subtracting height of an input from height of a navbar, and dividing by two
* Uses the same method as .navbar-form
* To use, add .navbar-btn to any button outside a form element
* Also add section to docs detailing buttons in navbars, and add more ids for the other unlinked and unmentioned sections in the side nav
More navbar CSS and docs cleanup

* Rearrange sections
* Add code snippets for text and links in navbars
* Add .navbar-link back in
* Add mention of .navbar-text, but it still needs to be re-implemented
* Update nav to reflect new order
run make on previous commits
Add cursor: pointer; to .checkbox and .radio and their inline counterparts
Merge branch '3.0.0-wip' of github.com:twitter/bootstrap into 3.0.0-wip