Prevent malformed quote bubbles on short quotes

This solves users with very short quotes creating malformed quote bubbles.

Before:
![snapshot119](https://cloud.githubusercontent.com/assets/1885159/5173463/2b523b82-7429-11e4-8d8d-a834a7e29136.png)

After:
![snapshot120](https://cloud.githubusercontent.com/assets/1885159/5173467/3092fff0-7429-11e4-93e7-199f34ef4d22.png)