Use sign or signed. Update readme for steps to actually get started

Use sign / signed where appropriate. Also updates the readme with the meteorite install info. 

![screenshot 2014-09-21 18 28 19](https://cloud.githubusercontent.com/assets/4588318/4350241/99f4ba06-41de-11e4-9ef1-593155f506fc.png)
![screenshot 2014-09-21 18 27 00](https://cloud.githubusercontent.com/assets/4588318/4350240/8e4bd928-41de-11e4-8b51-3d3a521834c2.png)