boneio v0.8.0dev8

• add Socomec E23 energy meter via Modbus,
• add CWT temperature sensor via Modbus,
• add very initial Orno-or-we-517 energy meter via Modbus,
• fix modbus discovery
• add posibillity to define modbus parameters
• add modbus_helper command line tool to set new address and baudrate for CWT temperature sensors and R4DCB08 DS18B20 - modbus extender
• change modbus check availability command
• add new option to group of outputs: all_on_behaviour, if True then if All relays are on groups is considered ON, otherwise if any is ON group is considered ON.
• add event and binary sensor examples for v0.7 board