Uncomment kythe code from the go and Java apis

[ciera]

We were having significant problems with kythe, as it is not go-gettable right now. Until that is fixed, I had to comment out all references to kythe from our protos and our go code. This will all need to be undone in order to reenable kythe.

[bzz]

Is there any known work-in-progress on the Kythe side in order to make it go-gettable?
Quick search over the issue tracker does not reveal much.

[collinw]

There is no on-going work to make Shipshape work with Kythe. We are no longer actively working on Shipshape.