Simplify javascript and css dependencies and add minified version

[rgrp]

• Get rid of jquery UI
  • Requires switching to bootstrap lookahead plus a small bit of coding for ajax part (see ​https://gist.github.com/2007241)
• Remove modernizr (what do we use it for?)
• Convert jquery.tmpl to jquery mustache (?)
• Remove ckanjs moving core parts of it directly into our code.

Compress everything for releases and add minified version to build (with switch to enable use of this?)