moved animation to make animate work

Hi Folks, 

Forgive me for my ignorance but I am not really up to speed with Sass/Compass etc, I'm just trying to get a build to work. 

I'm trying to move from Compass ruby to libsass and i'm in the process of dealing with all my dependancies. One of my dependancies ["animate"](https://github.com/ericam/compass-animate) throws an error when i try to use it with compass-mixins: 
```
Error: app/styles/vendor/compass-animate/stylesheets/animate/bounce:4: error: file to import not found or unreadable: "compass/css3/animation"
 [string exception]
```
I've done a hack to move the _animation.scss file into the location that animate was looking for it, and it complies fine. I have no idea if this is a sensible change so if someone could comment on this that would be great!