TNL-1898
Also adds a generic paginated list view and Teams list view. The
common PaginatedView takes a collection and a view class for its items
and creates a header and footer with correct pagination. The topics
list view is refactored to use this generic view.
Authors:
- Peter Fogg <pfogg@edx.org>
- Daniel Friedman <dfriedman58@gmail.com>
Django's `QueryDict`s are immutable during normal running, and so they
must be copied if any updates are to be made to them. In testing,
though, `request.DATA._mutable` is `True`, so tests can falsely pass.
Introduces a tabbed view component which displays its subviews and
handles Backbone navigation between each tab. This is used to implement
the "My Teams" and "Browse" areas of the Teams tab. Right now the
content of both tabs is stubbed out with a placeholder view which should
be replaced by TNL-1893 and TNL-1892.
