Updates to Static Defaults

- Changes `base.html` to use `static` template tag instead of `{{ STATIC_URL }}`
- Upgrades to the latest LESS compiler (1.6.0)
- Upgrades to the latest Moderizr (2.7.1)
- Upgrades to the latest jQuery (1.10.2) - No using 2.0+ yet because of lack of IE support
- Removes insecure content from the default 404 template