Staging final 0.6 release (#336)
Staging final 0.6 release (#336)

* Updated Xcode project setup instructions.

These modifications are based on the suggestions by Dave Fernandes here: https://groups.google.com/a/tensorflow.org/d/msg/swift/YntTUh6E20Q/LchmSQhIBAAJ

* Updating for the final release with the smaller Ubuntu binaries.

* Fixed CUDA 9.2 link.

tensorflow/swift,tensorflow/swift