rewrite the grid system. Clean shit up tons - only generate 12 columns by default - custom builder will do differently if you request it.

If you have less than 12 columns, container is too wide. Instead
generate container width using the @gridColumns variable.

Also remove duplicate container width property.

Tested and works in Opera 11.61

+ added translate3d to mixins.less

overhaul grid mixins and variables, standardize fluid grid system and enable it across responsive layouts

last minute addition of a simple fluid grid for our fluid examples; it needs work, so we're not documenting it now

Cleans up IE7 inline margins for buttons and adds them for sprites, also fixes button padding for large/small sizes

 - Lets us use rounded corners in IE9
 - Makes hover / active states work correctly in IE<=9

Only change for non-IE is that moving from hover -> not hovering
no longer animates (was a subtle blend) due to mismatch between the
bottom of the gradient and the background color.

Refactor: moves the primary button background to match the others.

overhaul frontpage jumbotron, add js for twitter buttons back in, fix up some form ids and classes, straighten out the use of primary button variable

revamp the mixins file to organize things a bit more, make placeholder text use a new variable instead of relying solely on @grayLight