Clarify GitHub API Instructions in Documentation

#### Before
![readme_before](https://f.cloud.github.com/assets/226228/1749741/3b4e3ac8-6538-11e3-96a1-796600bc7c22.png)
#### After
![readme_after](https://f.cloud.github.com/assets/226228/1749742/3c725dc6-6538-11e3-99fe-cd07850600dc.png)