TLC59116 I2C led driver for Zolertia Z1

Basic driver implementation for the TLC59116 on Zolertia Z1. It's an i2c constant-current led driver with 16 channels.

There's an example program included that cycles through all the outputs while dimming the tail.

It's a basic working implementation (code based on the adxl345 sensor). 
Things like output blinking and group control are not yet implemented though.