bump version numbers

bump version numbers

unit tests and refinements

v6.1.0

fix pod spec

Release 6.0 beta 6. See jessesquires#476 for details.

Release 6.0 beta 5. See jessesquires#476 for details.

Release 6.0 beta 4. See jessesquires#476 for details.

Release 6.0 beta 3. See jessesquires#476 for details.

Release 6.0 beta 2. See jessesquires#476 for details.