fixed symlink #147

As also discussed #185
added config required in django1.4 - #185

Added 3 lines of config required for the admin to work correctly in Django 1.4.5 (as installed in TKL v13.x) see https://github.com/turnkeylinux/tracker/issues/185
Merge pull request #1 from JedMeister/bugfix

admin related bugfixes (media symlink, required contrib entries)