Lets add some ui

Known issues:
- The way I'm redirecting from index to search is hella-ghetto. What's the proper Rails way to do this?
- Image size is wrong on the welcome index page. We need a migration to fix this, will do that in a separate PR.
- v1 UI. Still lots of little things I could do to make it prettier, still lots of room to add features, still time to overhaul this if everyone hates it.

Here's how this looks now:
![welcome](https://cloud.githubusercontent.com/assets/590055/3781467/8b27c5a6-1996-11e4-8ee0-27bd6ff7f0ff.png)
![search](https://cloud.githubusercontent.com/assets/590055/3781468/8b28246a-1996-11e4-89b0-0f059b54b2f1.png)
You could've kept this form tag which would've submitted the users regularly. Though you needed to do some fancy magic to ensure that click events throw the proper styles and stuff on them right?

You could probably move the `frenz` div into this form and it would work the same way. It would probably require a click listener on the dom node that would apply the styles and toggle the checkbox.