Minor fixes to code readability
Readability fixes in unit tests
Readability fixes for main pynag modules

Mostly pep8 style fixes
Whitespace fixes for pep8 compatibility
Update autogenerated_commands.py
generate_external_commands.py string formatting
generate_external_command produce better pep8 code

Previous code generated with generate_external_command was
not strictly pep8 code. This patch fixes that.
Re-run generate_external_commands

Updated autogenerated code is more pep8 friendly.
Final pep8 cleanup
Merge pull request #148 from pynag/readibility-fixes

Readibility fixes