Globalize gets a logo

![globalize](http://globalize.github.io/globalize/images/globalize.png)

I'm creating a pull request for this since there wasn't general agreement. Ref: https://twitter.com/parndt/status/391422841251315712

Here's the font: https://www.google.com/fonts/specimen/Righteous I like it, but there was some disagreement:

"awesome"
https://twitter.com/_tomash/status/391190374930079746

"not a huge fan"
https://twitter.com/svenfuchs/status/391189803485896704

I previously had another background:

http://globalize.github.io/globalize/images/logo-large.png
https://upload.wikimedia.org/wikipedia/commons/e/e4/Globe.png

but swapped it for a NASA photo.

I'm okay with anything, even scrapping this proposal entirely, or switching the background for something else. But I think we should have something. Comments/suggestions?

If anyone knows a real designer who wants to create something original for us, that would be great too (I am *not* a designer and do not pretend to be one...)

cc @parndt @tomash @svenfuchs