refactor fluid layout to be more specific to not interfere with modal content while adding right sidebar option

update variables to inlude @baseFontSize, @baseFontFamily, @baseLineHeight for easier customization; added placeholder for @primaryButtonColor, but didn't implement

huge update to forms, docs for the new forms, added a new link for js example to tabs/pills, add some new mixins

update alert message for ie7 to adjust dismiss icon, update example pages to clean up a few things from testing

comment out box-shadow on masthead and footer in docs.css because Opera sucks at inset box-shadow :"

remove theme.less and split preboot.less to mixins.less and variables.less to isolate customization from function

fix problem with error styles in forms that clashed with alert-messages by qualifying the .error with .clearfix