DATABASES and staticfiles for django 1.4

* On django 1.3+, multiple databases are supported in the form of a
'DATABASES' dictionary
* On django 1.3+, contrib.staticfiles is used instead of
ADMIN_MEDIA_PREFIX for serving static files

Signed-off-by: George Kargiotakis <kargig@noc.grnet.gr>
Django1.4 cache get() has a new attribute 'version'

On django 1.4 cache backend get() prototype has an extra 'version='
argument.

Add this with a default value of None

Signed-off-by: George Kargiotakis <kargig@noc.grnet.gr>
New template loaders

In django 1.4, load_template_source does not exist. Our template loaders
change to .Loader, as found on django template doc [1]

[1] https://docs.djangoproject.com/en/1.4/ref/templates/api/#loader-types

Signed-off-by: George Kargiotakis <kargig@noc.grnet.gr>
Minor typos emmiting syntax errors

Signed-off-by: George Kargiotakis <kargig@noc.grnet.gr>
Changed the installation guide for wheezy release
A minor fix
Add support for django-registration>=0.8
Mark caching in setting.py as a tod task
Add RSS feed support to display latest news
Merge branch 'wheezy' of https://code.grnet.gr/git/ganetimgr into wheezy
Merge master into wheezy
First commit with noVNC on wheezy
Fixes on noVNC integration
Cleanup noVNC files
Make websockets TLS a variable. Minor fixes
Add vnc via websockets variable to indicate enabled or disabled plugin
Block VM creation per cluster via disabled network selection
Add disable_instance_creation field in cluster model
Increase security with session timeout & passchange logout
Patch redis Django client to support the redis keys() function