Pixel Tool Bug Fix and New Images

I noticed a bug when using components. Occasionally it wouldn't be allow adding pixels. For example, the one in the middle was impossible to fill:

![screen shot 2013-10-18 at 4 10 45 pm](https://f.cloud.github.com/assets/4992934/1363758/709554ac-3831-11e3-9eb4-ee87857e9268.png)

I tracked this down to the method that determined what, if anything, was located at a particular coordinate. This was using bezierTools to measure the distance from the mouse position to the middle of the component. I made that less fancy with a simple test that checks to see if the mouse position is inside of a component's box. I can think of ways that this won't work (for example, if the contents of the component aren't drawn using the same grid). But, fixing those will over engineer the thing.

I also added a couple of new images because a pixel tool should have pixelated images.