i2c-test sample is up, and ready to use.
Minor define fix
Merge remote-tracking branch 'bacara/driver/i2c' into merge_bacara_i2c_sample

Conflicts:
	rflpc17xx/drivers/i2c.c
	samples/adc-test/Makefile
	samples/i2c-test-mbed-board/lm75b.c
	samples/i2c-test-mbed-board/lm75b.h
	samples/i2c-test/Makefile
	samples/pji-test/Makefile