moved scss files into final folder structure. Wrote docs for button groups. Various other small bits that snuck there way into this train of thought.
added dropdown style, classes, variables, mixins, etc
updated where style comes in for the dropdown mixin
updated variable comments
updated variables in each component class section, started reveal mixin
initial update to orbit plugin
Merge branch '4.0-wip' of github.com:zurb/foundation into 4.0-wip

Conflicts:
	docs/js/docs.js
	docs/layout.html.erb
	lib/assets/js/foundation/foundation.orbit.js
	scss/foundation/components/small-screen/_orbit.scss
finished reveal mixin
initial orbit update using viewport style approach
Merge branch '4.0-wip' of github.com:zurb/foundation into 4.0-wip
started sections mixin conversion
updated sections mixin
Merge branch '4.0-wip' of github.com:zurb/foundation into 4.0-wip
updated sections to test links in top-level
Don't prevent default on section witout content.
Merge branch '4.0-wip' of github.com:zurb/foundation into 4.0-wip
updating sections
Update JS folder structure, add TODOs in ported JS libraries.
remove modular-scale, compass dependency in Rails engine. also add initializer to update asset pipeline paths to that scss/ and js/ folders are automatically included
Move js to root for Mark.