Rework garage.torch.CNNModule (#2259)

It now takes an env spec and automatically computes the output size.
It also handles NHWC and NCHW instead of requiring an environment
wrapper.

This change also fixes several issues with the existing usage of CNNs
in pytorch.

Update release CI to remove redundancy (#2237)

Test deployment

Test tag regex

Test tag regex

Test tag regex

Test tag regex

Test tag regex

Change python version to 3.6

Add ray 1.0 support (#2084)