One more test

Checking if the session is closed even when a function
return occurs inside the context manager
Merge pull request #6 from thulio/function-inside-context-manager

One more test
Remove commit_on_success() manager.
Add commit_on_success kwarg to managed().
Merge pull request #7 from etandel/add-commit-on-success-kwarg

Add commit_on_success kwarg to managed()
Version bump: 0.3