style(demo): html and js easier to read.

**Before**:

![screen shot 2014-05-07 at 16 18 11](https://cloud.githubusercontent.com/assets/1214609/2908924/3527ff42-d62d-11e3-9407-dc173f996358.png)

**After**:

![screen shot 2014-05-07 at 16 18 31](https://cloud.githubusercontent.com/assets/1214609/2908926/3a210444-d62d-11e3-8ce5-05a0a47b94ee.png)