Adding dh-apparmor as build-dependency.

* Re-formatting dependencies for GlobaLeaks, which were way too long.
* Adding dh-apparmor as build-dependency.
  [was not installed on my system, dpkg was complaining about that.]
Changing source format from "quilt" to "native".

Actually we are providing the debian dir, and not have a debian version..
Restyling metadata.

* Using short-description and long-description in debian/control file.
  <https://www.debian.org/doc/manuals/developers-reference/best-pkging-practices.html#bpp-pkg-synopsis>
* Providing a Vcs-Git section.
Moving to setuptools.

* Use setuptools' setup() function in setup.py
* Update debian/ accordingly, adding python-setuptools as dependency, and using
  the newer pybuild instead of python_distutils for building the package. Among
  the other nice things, this will allow to run unittests to check the package
  before building.
Restyling setup.py.

* Using single-quotes in setup.py, keeping consistency with the rest of the
  file.
* Adjust indentation, and maintain it uniform in the file.
* Fix spaces in kwargs according to PEP8.
Merge pull request #231 from mmaker/enhancement/setuptools

Enhancement/setuptools