Bootstrap

This is my submission for Challenge 4.

> __Assignment 4: Bootstrap__
> Use Bower to add Bootstrap to your project.
> Rewrite your root page using Bootstrap.
> Demonstrate use of Bootstrap forms and components such as dropdown and tooltips.

It's use the spaceships' information from challenge 3 (#3) to display the ship images in full width.
Hovering over the ship's name will displaying the universe where the ship came from using `Bootstrap Tooltip`.

![screen_shot_2014-11-04_at_3_23_00_pm](https://cloud.githubusercontent.com/assets/3662104/4896559/f68ab6c8-63fb-11e4-810f-4dea1db2de03.png)

Click on the ship's image will display the ship's story in modal.

![screen_shot_2014-11-04_at_3_27_32_pm](https://cloud.githubusercontent.com/assets/3662104/4896593/96026318-63fc-11e4-840d-45bd63e62868.png)