Moved Python scripts to *raxas* package

Run scripts as follow:

```python -m raxas.autoscale```
Fix #34, created raxas package and improved pre-commit script
Add bump version support


pip install bumpversion
Manually bumped version
Bump version: 0.0.18 → 0.0.19
Fix #34, created ragax package
tidy up some stuff
Bump version: 0.0.15 → 0.0.16
tidy up stuff
Bump version: 0.0.19 → 0.1.0
Merge branch 'devel' of github.com:boxidau/rax-autoscaler into devel