Exclude .git/ directory when submitting to Cloud ML Engine (#1367)
Exclude .git/ directory when submitting to Cloud ML Engine (#1367)

The `.git` directory isn't used on Cloud ML Engine, therefor we should ignore it in the uploaded archive.

This reduces the size of the `.tar.gz` archive from a fresh clone of `tensor2tensor` from 15 MB to only 3.6 MB.
tensorflow/tensor2tensor,tensorflow/tensor2tensor,tensorflow/tensor2tensor,tensorflow/tensor2tensor,tensorflow/tensor2tensor