Couple of nitpicking changes.

Mainly cleanups, such as adding coverage, pruning whitespace, removal of python
bytecode, replacing some files with tabs by four spaces and making the tests
slightly slimmer.

I guess the most important change is the exchange of tabs by four spaces. This
is strongly recommended according to pep8:

http://www.python.org/dev/peps/pep-0008/#tabs-or-spaces

If you want, I can convert the rest of the code-base too.