Library can now be installed without existing "config.ini".

* A dummy "config.ini" is created if none exists.
* Improved comments in "config.ini.example"
Uploading to PyPi, and installing with pip works in principle.

There needs to be a more elegant solution for config.ini; currently pip
always shows an error for missing config.ini.
Installation with pip, and old method work.

Though not rigorously tested.
Adapted README to new installation method, and ported it to RST.

The README was also slightly expanded.
Removed unnecessary lines from .gitignore
Remove unused import.
Merge pull request #27 from eike-welk/master

Installation with **pip** now possible.