Bump version number to v0.12.4

Update MANIFEST.in

Py2.6: ignore missing _url_collapse_path in CGIHTTPServer

Bump version for v0.12.1

Don't rely on test.test_support being present

Update note about testing

Update porting doc

Bump version to v0.11.2

Bump version to v0.11.1

Remove a couple of dependencies on test.support (not available on tra…

…vis-ci for Py33)