Merge pull request #4 from x2q/master

Add mail template for DMI Borgervejr (Danish government weather service).
Corrected documentation - running module commands.
Bug fix: stop data store clearing cache at end of slice iterations.
Remove frequent writing of data to disc.
Data will always be saved when Hourly.py is run, so saving it as it is
processed creates unnecessary disc writes. When live logging the data is
saved every hour.