Clarify the building-from-source steps

CONTRIBUTING.md

@@ -42,21 +42,25 @@ Once that's done, you can get the k6 source into your Go workspace (`$GOPATH/src
 ```bash
 go get github.com/loadimpact/k6
 ```
+This will also build a `k6` binary and put it in `$GOPATH/bin`.
 
 **Building from source**:
 
-Now, standing in the repo root (`$GOPATH/src/github.com/loadimpact/k6`) you can build a k6 binary from source by running:
+Standing in the repo root (`$GOPATH/src/github.com/loadimpact/k6`) you can build a k6 binary from source by running:
 ```bash
 cd $GOPATH/src/github.com/loadimpact/k6
 go build
 ```
 
 **Running the linter**:
 
-We make use of the [`gometalinter`]() tool to lint the code in CI. To run it locally:
+We make use of the [gometalinter](https://github.com/alecthomas/gometalinter) tool to lint the code in CI. To run it locally, first install it:
 ```bash
 go get -u github.com/alecthomas/gometalinter
 gometalinter --install
+```
+then run:
+```
 gometalinter --deadline 10m --config gometalinter.json --vendor ./...
 ```
 

README.md

@@ -70,13 +70,13 @@ docker pull loadimpact/k6
 Grab a prebuilt binary from [the Releases page](https://github.com/loadimpact/k6/releases).
 
 ### Build from source
-To build from source you need **[Git](https://git-scm.com/downloads)** and **[Go](https://golang.org/doc/install)** (1.8 or newer). Follow these instruction for fast building:
+To build from source you need **[Git](https://git-scm.com/downloads)** and **[Go](https://golang.org/doc/install)** (1.8 or newer). Follow these instructions:
 
-- Get source `go get github.com/loadimpact/k6`
-- Now `cd` to `$GOPATH/src/github.com/loadimpact/k6` and run `go build`
-- Tada, you can now run k6 using `./k6 run script.js`
-
-Then make sure to put the `k6` binary somewhere in your PATH.
+- Run `go get github.com/loadimpact/k6` which will:
+  - git clone the repo and put the source in `$GOPATH/src/github.com/loadimpact/k6`
+  - build a `k6` binary and put it in `$GOPATH/bin`
+- Make sure you have `$GOPATH/bin` in your PATH
+- Tada, you can now run k6 using `k6 run script.js`
 
 Quick start
 -----------