adding the `&` combinator to `.placeholder` makes it work for the global case (in forms.less) as well as within `.navbar-search .search-query`

the result can be seen in the generated bootstrap.css, which include the -ms vendor extension.

implement ie7 fluid tests and semantic.gs IE7 hack for rounding in ie7; not perfect, but mostly solid

remove @shadow instances and replace with escaped values, update mixins to not use a default value at all

Added the back-face visibility css property to mixins.less, this property prevents the browser flickered experienced especially in Chrome when using 3D transformations.

1. Removed borders on .btn and increased line-height 2px to compensate
2. Set buttons to use the endColor of the gradient as the background-color by default for extra contrast between button and background
3. Set a 5% darker background-color on hover of buttons just for IE7

fix other instances of mixins, swap use of box-shadow everywhere, include border-radius and transition

The native box-shadow, background-clip and background-size instructions all take 1 or more arguments. In 1.3.0 LESS became arity aware, see https://gist.github.com/1933613. As a result the signatures of these mixins had to change a little.

in responsive layouts <767px, ensure inputs are not larger than 100% with box-sizing and a max-width