Combine and update variables
Clean up of variables and small tweeks

* Refactor flashes
* Change form variables to be consistant with base variables
* Update lists to have no list styles
* Remove margins on headers
* Remove padding in tables
Added to the readme
Fix header line-height
Added more documentation and refined some details
Merge remote-tracking branch 'origin' into mf-rails-engine

Conflicts:
	lib/generators/bitters/install/templates/app/assets/stylesheets/base/_grid_settings.scss