Setup Golangci linter

[jdknives]

We do some setup for golangci-lint in the Makefile but do not ever execute it. We should add a lint command to make format.

https://github.com/golangci/golangci-lint

[jdknives]

For now I will remove the linter references in the Makefile. We need to fix the bulk of the linter issues before we can enable the linter in Travis. Otherwise the builds are all going to fail.

Here is a list of issues the linter reported:

linter_output_cx.txt