Made test docstrings name util and config tests.

This is a modification to accomodate the way that nose checks docstrings
for test names.
Docstrings for Block tests.

Includes a minor fix for File blocks during path expansion.
Added docstrings for all Action tests.
Added docstrings for commandline tests.
Adds docstrings for all of the reader tests.
Merge branch 'documentation/test-docstrings' into dev