Improved home page

I made a bunch of changes to the home page.

You can see view the new page at http://beaver-coding.github.io/three.js-Site/
Some of the links there don't work (the documentation, examples, editor) because I only added the files necessary for the home page to that repositories.

I changed the format of the navigation links.  There are new About and Getting Started sections.  There is more space around the featured projects, and it shows the name of the project.  At the bottom of the page is a new footer.  The h2 tags are bigger and have a new color.  There is a new font family for the main content.  

I would appreciate any suggestions anyone would have.