Support DRV8XXX drivers

Fixed on Mega2560 and Due

https://github.com/firepick1/FireStep/blob/master/CHANGELOG.md

Tested with:

RAMPS1.4 with A4988 drivers @ 200 steps; 16 microsteps
EMC02 with A4988 drivers @ 400 steps; 16 microsteps
Arduino IDE 1.6.7 (NOTE: earlier versions of Arduino are NOT supported)
Arduino Mega2560, Arduino Due

dvs mova fix for Reef; idle camera lighting

FireStep/Arduino Stepper Driver and Client

https://github.com/firepick1/FireStep/blob/master/CHANGELOG.md

Tested with:

RAMPS1.4 with A4988 drivers @ 200 steps; 16 microsteps
EMC02 with A4988 drivers @ 400 steps; 16 microsteps
Arduino IDE 1.6.7 (NOTE: earlier versions of Arduino are NOT supported)
Arduino Mega2560, Arduino Due

Merge DueTimer changes

Merge coordination with DueTimer per Ivan's request.
No functional change
.

FireStep/Arduino Stepper Driver and Client

https://github.com/firepick1/FireStep/blob/master/CHANGELOG.md

Tested with:

RAMPS1.4 with A4988 drivers @ 200 steps; 16 microsteps
EMC02 with A4988 drivers @ 400 steps; 16 microsteps
Arduino IDE 1.6.7 (NOTE: earlier versions of Arduino are NOT supported)
Arduino Mega2560, Arduino Due

Upgrade to Arduino IDE 1.6.7

FireStep/Arduino Stepper Driver and Client

https://github.com/firepick1/FireStep/blob/master/CHANGELOG.md

Tested with:

RAMPS1.4 with A4988 drivers @ 200 steps; 16 microsteps
EMC02 with A4988 drivers @ 400 steps; 16 microsteps
Arduino IDE 1.6.7 (NOTE: earlier versions of Arduino are NOT supported)
Arduino Mega2560, Arduino Due

FireStep/Arduino Stepper Driver and Client

https://github.com/firepick1/FireStep/blob/master/CHANGELOG.md

Tested with:

RAMPS1.4 with A4988 drivers @ 200 steps; 16 microsteps
EMC02 with A4988 drivers @ 400 steps; 16 microsteps
Arduino IDE 1.6.5
Arduino Mega2560, Arduino Due

FireStep/Arduino Stepper Driver and Client

https://github.com/firepick1/FireStep/blob/master/CHANGELOG.md

Tested with:

RAMPS1.4 with A4988 drivers @ 200 steps; 16 microsteps
EMC02 with A4988 drivers @ 400 steps; 16 microsteps
Arduino 1.6.5

NOTES:

• Merged Paul's MotionBoard code

FireStep/Arduino Stepper Driver and Client

https://github.com/firepick1/FireStep/blob/master/CHANGELOG.md

Tested with:

RAMPS1.4 with A4988 drivers @ 200 steps; 16 microsteps
EMC02 with A4988 drivers @ 400 steps; 16 microsteps
Arduino 1.6.5

FireStep/Arduino Stepper Driver and Client

https://github.com/firepick1/FireStep/blob/master/CHANGELOG.md

Tested with:

RAMPS1.4 with A4988 drivers @ 200 steps; 16 microsteps
EMC02 with A4988 drivers @ 400 steps; 16 microsteps
Arduino 1.6.5

NOTES:
This release bridges FireStep v1.x and v2.x, permitting easy merges
of bug fixes between major versions. It is based on the fireduino
abstraction namespace for MCU independence.

FireStep/Arduino Stepper Driver and Client

https://github.com/firepick1/FireStep/blob/master/CHANGELOG.md

Tested with:

RAMPS1.4 with A4988 drivers @ 200 steps; 16 microsteps
EMC02 with A4988 drivers @ 400 steps; 16 microsteps
Arduino 1.6.5

FireStep/Arduino Stepper Driver and Client

https://github.com/firepick1/FireStep/blob/master/CHANGELOG.md

Tested with:

RAMPS1.4 with A4988 drivers @ 200 steps; 16 microsteps
EMC02 with A4988 drivers @ 400 steps; 16 microsteps
Arduino 1.6.5