Added Cross Browser Timeline

Added Cross Browser Timeline support to the Browsercast.

1. Works on all popular desktop browsers ( HTML5 compatible versions).

2. Indicates the current slide with the green color.

3. Adjusts and fits automatically on window resize.
![firefox](https://f.cloud.github.com/assets/4943507/2435689/e5f928f2-adcc-11e3-8168-149448829724.png)
![chrome](https://f.cloud.github.com/assets/4943507/2435688/e5f904b2-adcc-11e3-887a-3bd804c23d6f.png)
![opera](https://f.cloud.github.com/assets/4943507/2435690/e5f9fc1e-adcc-11e3-8305-cd9df1b2ffee.png)