Renamed a block to normalize the naming scheme a bit.
Get rid of duplicate jQuery loading.

It's loaded in the main.js file via require.js.
This also moves the body_extra base block at the end of the <body> tag.
Fix #242 - Add canonical link to document header.
Cosmetic fixes to the JS files.
Ported JS in doc template to require.js modules.
Updated require.js to latest version.
Updated modernizr.
Merge branch 'master' of github.com:django/djangoproject.com