WIP (unidirectional with speed and bidirectional with switch working)
WIP
[WIP] H-Bridge with 2 pins working (on/off and speed)
add some commentes for on/off
Merge branch 'master' into motor-driver-refactor

Conflicts:
	examples/firmata_dc_motor_speed.rb
motor speed and switch (on/off) with h-bridge and transistor
motor driver tests
A few small edits to motor examples
Merge pull request #4 from hybridgroup/motor-driver-refactor

Motor driver refactor