Travis: --use-mirrors is deprecated in pip 1.5
Docs cleanups: Put all Fabric commands in a section

This increases readability on the index page, since this way no command
is being listed there.
Get TITLE and DESCRIPTION from siteconfig directly

Instead of changing django.conf.settings at runtime which we should not
be doing:
    https://docs.djangoproject.com/en/dev/topics/settings/#altering-settings-at-runtime
and is the source of bug 3150.