Support for 'latest' paths that aren't the root.

Bumped to v 0.2.0, 'latest' support warrants it I think.
Added ability to redirect 'latest' for specific paths, not just the index.
Added tests for all 'latest' behavior.
Updated readme with 'latest' stuff.
Moved DOCFILESDIR out of test_filekeeper because it's needed in test_hostthedocs.