Smaller Version and more maintainable code

[Eike Send]

Hi!

I've worked on the code. A lot. And I created a branch in which the code is a little denser and easier to maintain. At least I think it is. Check it out:

https://github.com/eikes/intro.js/blob/smallification/intro.js

[Afshin Mehrabani]

It's really nice. I think we can talk about this nice version on IntroJs on Github, so we're able to see the changes better.