Allow noaho to be pip installable

I tried to install noaho via simple ``pip install noaho``. The build + install phase worked perfectly, but the ``noaho`` module was completely empty: nothing could be imported from it.
This came from the fact that you declared (in the setup.py) that the ``noaho`` module should be packaged and installed, whereas only the ``noaho.so`` is of interest.

Pip thus creates a ``noaho`` folder with an empty ``__init__.py`` file inside, which will be imported (instead of ``noaho.so``) when doing ``import noaho``

By removing the ``packages=['noaho']`` line, pip will not create the ``noaho`` folder in the virtualenv site-packages directory. Hence, only the egg file and the ``noaho.so`` file will be found.

The other modifications are just whitespaces.
Signed-off-by: Balthazar Rouberol <balthazar.rouberol@mapado.com>