remove unused examples, update examples docs page, add starter template to examples, remove warning alert banner, add screenshots

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

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

spec'ed out an examples overview page with links to current examples; examples still need work themselves though

update docs to include separate responsive css, update docs to highlight proper file name, updated makefile to build responsive separately

move css builder and downloader to dedicated page, start to update remaining sections on LESS docs page