beta7 (b7) release

• [NEW, FIX #5] Initial support for WHO=4 Thermoregulation on BUS. Currently supported: zones room thermostats and external (wireless) temperature sensors. Both heating and cooling functions are supported
• [BUG] corrected a bad bug on the connection part (originally taken from the BTicino 1.x binding) that caused loosing many monitoring (feedback) messages from the gateway when several messages were received together
• [FIX #13] now commands sent close in a short time are sent re-using the same socket connection to the gateway. This should improve connection stability and speed in general and in particular with older BUS gateways (e.g. MH202)
• [FIX] improved Shutter management and position estimation, thanks to previous 2 enhancements
• minimum requirement is now openHAB 2.3, which is needed to support measurements units like °C