Cleanups for pep8

Corrected to make pep8 pass.  Did not change anything else, but could
use some standard ways of dealing with strings across modules.  Also,
set file perms to 644 on files which are not executables.

Not everything is pep8 compliant yet.  There are a few tricky ones I
will leave for @j05h.
Merge pull request #13 from retr0h/retr0h/pep8

Cleanups for pep8