Merge pull request #403 from wolfmanjm/upstreamedge

fix bug in extruder which was introdcuded by multiextruder edits. F shou...
update firmware.bin
Merge pull request #405 from wolfmanjm/upstreamedge

Workaround driver sending 3 bytes more than packet size by adding 4 byte...
Add 1 to recieved frame index to get length