Fix small errors and typos across the board

Fixed the things that my linter (pyflakes 0.7.3) picked up,
with the exception of the following:

./modules/rfc/cmd_list.py:27: undefined name 'channelNames'
./modules/rfc/cmd_list.py:28: undefined name 'channelNames'

These will need to be looked at by someone who knows what the code
is actually meant to do.
Add self to contributors list