This bumps the somecomfort requirement to 0.2.1 to pull in a change
that makes handling no-fan systems graceful. Adds a test that should
prove it gives us what we want.
If no fan, then fan is always idle and fanmode is None.
This lets you optionally only add thermostats by location or
specific device id, instead of all the thermostats in your
account. This would be helpful if you have two devices in different
houses (i.e vacation home), etc.
