remake the box-size grid, nuke fluid grid docs, fix up examples, clean up form styles
grid docs changes
Merge branch '2.1.2-wip' into box-sizing-exercise

Conflicts:
	docs/scaffolding.html
	docs/templates/pages/scaffolding.mustache
nuke fluid grid docs again
commenting out stuff and adding grid test page
latest tweaks to grid classes for forms
more tests and experiments
headway, cleanup, and tests
Merge branch '2.1.2-wip' into box-sizing-exercise

Conflicts:
	docs/assets/css/bootstrap-responsive.css
	docs/assets/css/bootstrap.css
	docs/base-css.html
	docs/templates/pages/base-css.mustache
	less/forms.less
	less/mixins.less
remove ie7 support from mixins
remove all ie7 conditionals and mixins
make .input-* classes match .btn-* size classes
remove references to row fluid elsewhere
remove remaining fluid grid css
thumbnails cleanup: no more UL or LI elements needed, instead just use standard grid markup
initial pass at removing navbar-inner from .navbar component
increase padding on navbar links, remove font-size override on .navbar from docs css
restore gradient to navbars
remove .dividers from breadcrumbs, instead use :after and content
cleanup breadcrumbs less code (nesting)