Refactor duplicate code for checking if cpanm is installed.
Regen README.
Scratch a few TODO items.
Cleanup Tests: clear_buffer is called for us before each action.
Clean up lock test a bit.
Each action knows its own lock type now.
Improved method names.  Chrome::Null is gone.

The Chrome baseclass effectively serves as a no-op chrome.
I prefer to always return 0 or 1 from a boolean method.
Add tests for Chrome.
It's not plural!
Add convenience methods for getting the repo and a stack.
Merge branch 'master' of github.com:thaljef/Pinto
Show pin status, not revision id when printing registrations.