static: Move jQuery, again.
Just vendor bootstrap

This is easier that relying on django-twitter-bootstrap, as we can now
include and use variables and mixins from bootstrap in our own less.
templates: Fix up header and nav responsivness
less: Better variable names
lib: Clearer error output from less compiler
style: Import bootstrap manually, customise navbar

Color the navbar as Sam intended, by overriding bootstrap variables.
templates: Made a start on the postnav splash
style: Tone down border-top on postnav splash
templates: Remove jQuery -- not currently using it
static: Vendor the WebFontLoader to avoid FOUT