Fix memory leak in Repository_head__set__
Fix memory leak in TreeBuilder_get
tests: get nice error when test module is broken
Fixing coding style with the help of pep8 (wip)
tests: find out test modules automatically
Coding style: Silent pep8
Merge branch 'master' into master-py24

Conflicts:
	test/test_blob.py
	test/test_config.py
	test/test_diff.py