Fix up the docs somewhat.

There are so many ways to do this, I hesitate to to recommend one.  Ways: 

1. Temp GOPATH with GOBIN set.  Either some dir that is already in your path (`/usr/local/[go/]bin`) or suggest something sane (`~/bin`) and instruct users to add taht to their path.
2. Persistent GOPATH for go tools -- say `~/src/go-tools`.  Add `~/src/go-tools/bin` to your path.
3. Use go "the right way" and have a GOPATH that you set up for your project and install it there

Here is what I would say:

---
There are many ways to build and host go binaries.  Here is an easy way to get utilities like `godep` installed:

1. Create a new `GOPATH` for your tools and install `godep`:

    ```sh
    GOPATH=$HOME/src/go-tools
    mkdir -p $GOPATH
    go install github.com/tools/godep
    ```
2. Add `$HOME/src/go-tools/bin` to your path.  Typically you'd add this to your `~/.profile`:

    ```sh
    export PATH=$PATH:$HOME/src/go-tools/bin
    ```