add override ability for order_by display names
* incorporates pull #50 from @rossp, but with tests
use `label` and `name` from filter in `order_by`, when set
added class-based view which addresses pull #52 from @lambdalisue
* based upon Django's ListView
* docs updated and deprecate `object_filter` functional view
* `object_filter` is now basically a wrapper for the CBV
* added a `filterset_factory` to filterset.py
fix for unicode string errors in CBV
use items() not iteritems in CBV for py3k compatability
Merge branches 'better-ordering-field' and 'class-based-view' into multimerge
remove unsued imports and unneeded functionality from ListView
[ci skip]
Merge branch 'local/class-based-view' into local/multimerge
Merge pull request #72 from nkryptic/multimerge

Updates to multiple pull requests and some improvements
Merge branch 'master' into declared-filter-with-field-choices