Add simple NPM package and Grunt build
Initial stab at conversion

WIP

* Nix mixins in favor of nib/transparent mixins
* Nix unnecessary punctuation
* Remove some IE7-8 support
Add docs from Bootstrap source for previewing, tell Grunt to build there
Design updates

* Add Avenir as a body font
* Smaller default border radiiii
* Flatter, smaller shadows (or glows, eg. form inputs)
* Nix button gradients
* Rename reset to normalize (for some reason this wasn't compiling)
* Inset dropdown link style