Allow multiple verbosity levels

[kwurst]

The current verbose feature outputs very detailed messages. Allow multiple verbosity levels.

• Lowest level of verbosity should be outputting the just the names of the directories being processed.
• Middle level of verbosity should output the files being processed.
• Highest level of verbosity should output the individual commands.

[StoneyJackson]

How about making the middle level default and providing two command-line options to specify the other levels:

• -v, --verbose - prints commands being issued
• -b, --brief - prints only the submission directories as they are being processed