Update info on Heatmiser polling interval (+9 squashed commits)
Squashed commits:
[67377bf] Don't commit duino node to heatmiser-feature
[ea13342] Handle weird variable crossover bug
[d1d1776] Added try/catch around duino board creation. Added customisable pol interval to heat miser node
[0a4b2a4] Added duino support for RC switches and added error handling to heatmiser
[7a987b2] Updated readme to include heatmiser node.
[ac9d242] Updated help files, standardised node convention

Don't commit duino node to heatmiser-feature

Update info on Heatmiser polling interval
Update setInterval to include clearInterval. Update copyright notice. Split out input and output functionality into separate nodes