Remove uses of sprintf

OpenSSL 1.0.2 is out of beta - let's update our own repositories to reflect that.

Updates the Go dockerfile to reflect the package restructuring.

Merge new invoke api

Correct an out-of-date path in a comment.

Documentation

Addressed review comments.

Fixes a regression in the ruby dockerfile

Windows fixes

- also corrects an error in the Go client test command

- the line that built and installed grpc ruby was mistakenly removed.

fixes a typo

Grpc ruby cleanup readme remove internal references

Grpc tools add go dockerfile