Adds support for Arduino Due and Teensy 3.0 boards

[soundanalogous]

Tested with BreakoutJS client. No issues encountered. All firmata features appear to work for Due and Teensy 3.0 (including Servo and I2C).

To use Due, you need Arduino version 1.5.2 or greater and you need to copy Firmata to:

/hardware/arduino/avr/libraries/
and
/hardware/arduino/sam/libraries

To use Teensy 3.0 you'll need a fresh install of Arduino 1.0.3 or Arduino 1.0.4 (Arduino 1.0.5 is not yet supported) and install the teensyduino application. After installing teensyduino, replace the existing Firmata library with this one.

[soundanalogous]

I want to cut a new release (Firmata 2.4 or Firmata 2.3.5?) with this update soon. Anything else to add?

[ntruchsess]

assuming the new release would be based on 'configurable' I'd suggest to go with '2.5'. If the new release is just meant to be a minor upgrade (adding Teensy and Due to master), better stay with 2.3.5.

[soundanalogous]

This will just be a minor upgrade (adding the new board definitions for Teensy and Due and anything else that is already merged into dev).

I'd like to get the configurable branched merged into master soon though and try to get it into the Arduino 1.5.3 release. Not sure when that release date is. We'll also have to update to conform to the new library specification that will be in place as of Arduino 1.5.3 (#56).

I've added a milestone for a Firmata 2.5 release: https://github.com/firmata/arduino/issues?milestone=3&state=open. Set date to June 15th but that may move once I get info from the Arduino team on the expected Arduino 1.5.3 release date.