Merge pull request #18 from wrongu/app-restructure

tooltips and weather null fix
Merge pull request #19 from wrongu/app-restructure

helpers.system_dict speedup with filter for latest
Merge pull request #20 from wrongu/app-restructure

Solar hot water
python 2.6 dict comprehension in water scraper
live greenhouse data (special case of arduino system)
removed markers from plots
Merge branch 'arduino_greenhouse_temporary' into lookup-tables

Conflicts:
	server/timeseries/helpers.py
	server/timeseries/templates/timeseries/live.html