Log Message:
py-nose2: updated to 0.9.1

0.9.1

Changed
* the prof plugin now uses `cProfile` instead of `hotshot` for profiling, and
  therefore now supports python versions which do not include `hotshot`
* skipped tests now include the user's reason in junit XML's `message` field

Fixed
* the prettyassert plugin mishandled multi-line function definitions
* Using a plugin's CLI flag when the plugin is already enabled via config no
  longer errors -- it is a no-op instead