The most of things are ported
Fix test_make_blob() failure on Python 3
Fix broken test_strip()
Fix test_transform_errors() failure on Python 3.2
Now it also works on Python 3.2 and 3.3.
tox can take pytest options
Compare colors without alpha for normalize test
Fix wrong use of posargs
Mark test_gif slow
Merge branch 'python3' into sequence
rotate hasn't been tested
test_crop is not that slow
Separate test_gif to three tests