UPDATES:added highcharts gauge for[ temperature, modified css style sheets
current fuctionality:
1 realtime charts page complete
2 history charts page complete
3 system settings page, feul price, temperature sleep time & profiling ctrl bit can be updated by user
4 short term predictions complete, include: weekly usage in litres, weekly cost, date when the tank was last filled & a predicted refill date
5 system sends email when tank level is low, need to add functionailty to allow the user to set an email address
6 commit includes script backup