Adding ability to record intermediate graph outputs (#1588)
* update calibrate.py with intermediate nodes and outputs
* update calibrate.py graph augmentation
* update calibrate.py with graph augmentation
* adding (rmin, rmax) generation for added nodes across inputs
* replacing arithmetic averaging with min of min values and max of max values
* update README with calibration description
* adding capability to load images
* updating README with new user experience flow
* adding main() function to calibration.py
* added image normalization and updated main() function
* updating README with example usage for calibration
* adding smooth averaging
* making augmentation and data collection implementations more clear
* remove smooth_average.py
* cleaning up calibrate.py
* addressing PR comments
* adding ability to generate calibrated, quantized model
