Remove admin media files

..and use the original ones provided by django

Signed-off-by: Dimitris Aragiorgis <dimara@grnet.gr>
Switch to django 1.4.5 with static_url

Use admin static files in templates as well

Signed-off-by: Dimitris Aragiorgis <dimara@grnet.gr>
Include dimara.css in scripts template

Signed-off-by: Dimitris Aragiorgis <dimara@grnet.gr>