- add a delete/uninstall possibility
- Makefile/setup.py call for doctests
- List _all_ dependencies in terms of packages for debian (python/numpy headers
  sphinx etc...)

- Figure for sigmoid/core philosophy
- math symbols in documentation according to
  http://matplotlib.sourceforge.net/sampledoc/extensions.html
  in particular:
  :math:`f(g(x,m,w))` for inline math and

  .. math::

  f(g(x,m,w))

  for display style math.

- Tutorial 1
 - suggest using ipython, especially object? and %cpaste for examples
