Attempt to improve performance by eliminating a sleep call
Attempt with subprocess instead
Return the actual return code
Performance hack
Nicer interfaces
Merge remote-tracking branch 'origin/performance_test' into performance_test

Conflicts:
	pre_commit/languages/python.py
Merge remote-tracking branch 'origin/master' into performance_test

Conflicts:
	pre_commit/languages/python.py
Merge pull request #26 from pre-commit/performance_test

Performance test