When posting a request via requests.post the json field was dumped to json, but it shouldn't have been since requests deals with this internally. That meant that the requests made by the code didn't match proper JSON.
In line with this, the API was only parsing this type POST requests correctly, making add_appointment to fail if a proper formatted JSON was passed.
On top of that, empty appointments were not checked in the Inspector before trying to get data from them, making it crash if a JSON was posted to add_appointment not containing the `appointment` field. Unit tests for this should be added.
Configuration parameters are now load from a .conf file (see template.conf as an example).
The code has 3 config levels: default (teos/__init__.py), config file (<data_dir>/teos.conf) and command line.
Most of the config parameters are only modificable trough the config file for now.
The priority order is: command line, config file, default.
Objects that need config parameters are now built in teosd instead of inside other classes. Therefore teosd acts like a factory and config parameters don't have to be passed around between objects. This also implies that a lot of the object creation logic has been changed.
This should simplify unit testing.
