Removes client side LESS compilation with server side generation of CSS
with grunt.

* Running grunt will listen to any changes to the layout.less file, and
  generate / update the layout.css file accordingly
* This depends on the grunt-contrib-less and grunt-contrib-watch plugins
* This layout.css file is also minified by the gruntfile
* I'm going to store the generated CSS in our static files for the moment,
  but eventually we could just call grunt as a pre/post commit git hook
  and only place the LESS in version control.