Updates for firmware 0.4.0

If you are using BrewPi with an Arduino, please change your active branch to legacy.

This new release did not fit into an Arduino and it is unlikely we can make it fit in the future. To keep using your Arduino version of BrewPi, and to prevent our update scripts from updating the UI to something that only works with 0.4.0 and later, change your branch to the 'legacy' branch. Run the updater with --ask. It will ask you which branch to check out. Choose 'legacy'.

sudo python updater.py --ask

For BrewPi Spark users, this is what is new in the web UI:

• Support for manual actuators in the device list, which can be toggled by hand (thanks @lukepower)
• Support for valves
• An EEPROM reset button
• Updated advanced settings fields for the new controller version
• When editing a profile, 1d2h4m will be converted to 1 day, 2 hours and 4 minutes (thanks @lukepower)
• New controller state is displayed as JSON