Updates to the Install page

**Non-installable platforms**
![image](https://cloud.githubusercontent.com/assets/25212/3682067/f2c200c0-12c3-11e4-87d5-dc2b22985284.png)

**Installable platforms**
![image](https://cloud.githubusercontent.com/assets/25212/3682069/03c8f43c-12c4-11e4-88e1-6652d7f6aa24.png)

Decided to leave as is and maybe come up with a way to flag 'dev' in here later on? If someone ends up finding /test/install somehow - it's not really catastrophic.