Remove unused basket apps and files

This is the first step in cleaning up basket. It aims to remove
unused apps and files, but make the minimal other changes needed
to continue working, to make this set of changes feasible to
review.
Merge pull request #48 from dpoirier/remove-unused-apps
Use nose, since we have it installed already anyway
Move `news` app up to top level

And make a few related edits elsewhere (not many, though)
Merge pull request #63 from dpoirier/use_nose
Improve project README and move news app info to README.