Merge pull request #30 from mikeller/add_serial_multi_support

Added support for serial MULTI protocol (serialMode == 5).

v0.54 - FW v3.8.5

v0.53 - FW v3.8.4

v0.52 - FW v3.8.3

v0.51.4 - FW v3.8.2

v0.51.1 - FW v3.8

v0.51 - FW v3.8

v0.50 - FW v3.7.4

v0.49.1 - FW v3.7.3

v0.49 - FW v3.7.3