Fixed alignment of the grid so that it properly fills the screen.

- Grid changes
	* Gave each column div a width and had them display inline so that they all line up.
	* Gave the row divs the height (the width is inherited) and floated them so that they just fall under each other since they are in a column div of the same width.
	* matrix.js has been adjusted to use this new HTML setup.
- Got rid of some extraneous CSS.
- Darkened the .green color.
- Added functionality to spawn multiple Wordfall's per tick of run. Set numSpawn to change this, currently set to 1.