Python 3.3b2's importlib doesn't like sys.paths that dissappear. By having a relative path in sys.path and then doinga chdir() that's exactly what happens. This bug will be fixed in the next 3.3 release, but there is no drawback to adding the path as an absolute path, so we do that to make the tests run under 3.3b2.

--HG--
branch : distribute
extra : rebase_source : 51c5ac7f8916ca85fb2633b8cdbd7aa2e759e67e