Initial check-in

* Working code, generates sawtooth on DAC1, use a jumper to ADC1,
  channel 11, reads ADC1, writes to DAC2 with a one cycle (about 24us)
  delay
Add libraries from STM32F4-Discovery_FW_V1.1.0

* Modify Makefile to use Libraries but not Utilities (wasn't using
  anything from there anyway)