Added django.contrib.humanize, a set of template tags for adding a 'human...

Added django.contrib.humanize, a set of template tags for adding a 'human touch' to data. They're documented in add_ons.txt.

git-svn-id: http://code.djangoproject.com/svn/django/trunk@3076 bcc190cf-cafb-0310-a4f2-bffc1f526a37