Initial support for Teensy 3.1

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+Build Instructions for Teensy 3.1
+
+This assumes that you have TeensyDuino installed and set the ARUINO environment
+variable pointing to the where Arduino with TeensyDuino is installed.
+
+```
+cd teensy
+ARDUINO=~/arduino-1.0.5 make
+```
+
+To build the loader
+
+```
+cd teensy/loader
+make
+```
+
+To upload micropython to the Teensy 3.1.
+
+Press the Program button on the Teensy 3.1
+```
+make upload
+```
+
+Currently, the python prompt is through the USB serial interface.
+
+The LED will blink (100 msec on/100 msec off) while waiting for the USB Serial
+device to be configured, and will blink (200 msec on/200 msec off) while
+sitting at the readline prompt.
+
+Currently, there is no I/O support configured (no GPIO, ADC, etc).