Don't --use-mirrors in Makefile
Use correct radio value for checkout gateway form

This fixes a bug where selecting "anonymous" checkout would think you
wanted to register first.
Use a PyPI version of Haystack

This requires a more recent version of Whoosh for the sandbox too.
Minor search tweaks

The start of a final push to get search ready for 0.6.
Remove import_module
Remove suggestions view from search app

This will return in a stronger form for v0.7.
Adjust demo shipping methods for 0.6
Update demo checkout for 0.6

Fix issue with submit() method and a few other small issues.

Fixes #913