How to get buildifier: the BAZEL BUILD file formatter

1. Install Go:

Install Go Development Kit on Mac:

https://golang.org/doc/install?download=go1.8.1.darwin-amd64.pkg

Install Go in ubuntu:

Follow    https://golang.org/doc/install#install

mkdir ~/go

    echo export GOPATH=${HOME}/go >> ~/.bashrc

    source ~/.bashrc

2. Install Buildifier by:

go get github.com/bazelbuild/buildtools/buildifier

This will put the buildifier in ~/go/bin/buildifier in mac, go/bin in ubuntu