planned_features is a view of where the keybrd project is headed.

Top priority
============
Add interrupts for I2C

Med priority
============
Add support for Teensy LC micro controller

Add 16x16 matrix capability (currently limited to 8x8 matrices)

Low priority
============
Add matrix-to-layout transform array (to decouple matrix from layout)

Change tutorial sketches from teensy 2.0 and PCA9655E-D IOE to Teensy LC and MCP23018 IOE

Add more tutorials:
* tutorial_5_LEDs.md
* tutorial_6_mapping_matrix_to_layout.md
* tutorial_9_active_high.md
