FID Inception weights

This release is a placeholder to host a specific version of Inception weights.

Namely, the original FID score implementation uses other Tensorflow weights (http://download.tensorflow.org/models/image/imagenet/inception-2015-12-05.tgz) than the Inception model available in Pytorch (http://download.tensorflow.org/models/image/imagenet/inception-v3-2016-03-01.tar.gz). The weights available here are the original FID weights converted to Pytorch.