Merge pull request #11 from boneskull/master

revert() enhancements
Merge pull request #12 from boneskull/master

version bump
Merge pull request #13 from boneskull/master

cleanup
Merge pull request #14 from boneskull/master

updating README.md regarding revert()
Merge pull request #16 from boneskull/master

changes for 0.5.0