This is a major change in the nomenclature of pickett.

These changes make the algorithms and documentation much better, but
there are little functional changes.
Merge pull request #3 from iansmith/naming_cleanup

This is a major change in the nomenclature of pickett. 

This is being merged so @tocolar @nordsieck have a stable place to work from.

I *know* it's bad form to merge a giant pull request like this, but this is a strange case as we are all moving to working from forked repos not in branches.