more gitrepo tests
test borrowed from Python source at http://hg.python.org/cpython/file/bcbad715c2ce/Lib/test/test_defaultdict.py
Merge pull request #77 from pall-valmundsson/more-util-git-tests

more gitrepo tests
unittest2 support
Merge pull request #76 from pall-valmundsson/test-defaultdict

test borrowed from Python source at http://hg.python.org/cpython/file/bc...