Tagging repository before switch to PyTorch 1.1.0

Update ADC_DDPG.py to comply with latest Coach changes

Updated distiller version in setup.py script

For release to support PyTorch 1.0.1 and pip installation

v0.2.1 is the best known 'master' branch for PyTorch 0.4

Changed the version from: "0.2.0-pre" to "0.2.0"

resnet20_slimming.yaml: fix example command-line string