Pagination on containers

[Petahhh]

The following changes add pagination among containers. It is achieved by using a basic form and POST. The backend keeps track of what "marker" the user is at with a list stored in the session. This marker is used in swiftclient.client.get_account's marker paramter (http://docs.openstack.org/developer/python-swiftclient/swiftclient.html#swiftclient.client.get_account) to get containers starting from after the marker.

Some potential changes to this arrangement include:
-Moving the logic from views.py:containerview() to a model?
-Replacing the form post with ajax

A known bug:
-After a user clicks "get next", loads the page, and then refreshes, the next page will load instead of refreshing the current page. This can be fixed by using ajax instead of form/post.

Please let me know your thoughts, I am completely open to any changes to get this patch landed.

Thank you,

Peter

PS The gif below is weird and flashy in the first few seconds but then it calms down and you can see the demo.

Peter