Implement basic nowcasting task.
Use larger extent and longer vector period for nowcast.
Improve image script.
Adjust timestamp last composite to make fews times correct.
Adjust nowcast to log scale vector determinatuin and accumulate 5 minute data.
Add data geotiff creation script.
Merge branch 'arjan-nowcast'
Remove settings which seems no longer in use.
Update h5py, add raster-store and checkout revision with mr developer.
Add version requirement to raster-store.
Add script to export radar data into a raster store.
Finish export to store script.
Fix optional image label.
Add basic logging to organize script.
Make limit for archived / operational dwd data configurable.
Merge branch 'master' into jabbeke

Conflicts:
	CHANGES.rst
	openradar/scans.py