Fix a problem with application.js to allow the modal to work.

Hey Larry -

This one took me a bit to find because it looked SO CLOSE to perfect.

There was a missing word, "require" in the `application.js` file that was added when we installed the twitter bootstrap gem in lesson 7, which caused the problem.  The code around the modal is fine.

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As a side note, this is a GitHub pull request.  This is how I can show you code that I think you should add to your project.  It allows you to look at the code, you'll see the green code is code that's added and the red is code that's deleted.  The "Files changed" tab will show you the code.

"Commits" will show you a listing of the individual commits I'm trying to send you.  And this tab, the conversation tab you can use to communicate about the change.

If you want to suck in all this code into your project you can by pressing the green merge button.  After you press the merge button, you'll have to update your web dev environment to have the latest updates from GitHub and to do that you can run this command:

```
git pull origin master
```

Hope this helps.

Aloha,
Ken