Pass the right args when pulling help from commands

Pass the application, not the HelpCommand, to each command
class when it is instantiated to extract the help text.

Addresses #52

Change-Id: I8de7c37f859a5783b80d6ad8d8eab0099b773e08
Enable debug in help mode

Look for the debug flag when running the help command
and log more details.

Change-Id: Idbf294f9a63da650758cab175a24cfa65d482a68