Fix for Issue 15: RegulationMode and fallback.

[winterborn]

Small changes to address issue here. The changes will allow the thermostat to maintain a permanent adjustment when the temperature is set, solving the issue with extended absences as you described.

Configuration Example:

To make this functional, you would add a line in your Homebridge configuration for your thermostat plugin like so:

"regulationMode": 3

This would set the mode to "Permanent" as per your choice.

regulationMode:

• 1 (Schedule): Follows the scheduled programming of the thermostat.
• 2 (Temporary): Temporarily overrides the current setting until the next scheduled change.
• 3 (Permanent): Overrides the current setting indefinitely until manually changed.

[betabob]

@derekprior can you please review this pull request?

[betabob]

@derekprior can you please review this pull request?

@derekprior pretty please?