further cleaning up repo for Jekyll processing
cleanup, grunt & bower

- removing some js libs and "_tools" from the h5bp template that are
not being used
- added bower version of jQuery, removed old template version of jQuery
- added a grunt file to support less compilation and minification
using bower/grunt for modernizr and respond.js
Converting some CSS to LESS
trimming down some unused bits, using normalize-css for reset
Merge branch 'master' into experimental