Fix a reference to an old project to point to the right place.
Fix doc problems

1) A few modules weren't on readthedocs because they couldn't import
dependencies there.  Put fake modules in sys.modules in conf.py to make
those problems go away.

2) Fix some references in the .rst files to make sphinx happy.

3) Clean out some files that we don't need.
One more fix, a reference to the readme
Merge pull request #130 from nedbat/ned/fix-docs

Fix various warnings and missing things in the docs