Documentation-o-rama

A first stab at documenting the three projects.  More detail on Kronos than the other projects.  Also some information on contributing, style guide, etc.
A few questions on this line:
* 2-space tabs would be a notable exception, but it sounds like you are saying they are recommended by PEP8.
* Did you mean indentations as spaces? That is both what PEP8 says to do and what we are doing.
* PEP8 says to wrap at 79. Are we doing 79 or 80?

One possible rewrite:
We generally stick to PEP8 for our coding style, with the exception of using 2-space tabs. Be sure to indent with spaces and wrap at 79 characters.