Cleanup readme.

Squashed commit of the following:

commit e120e80b41676f2a5b5e9e2211f8221bbbf98306
Author: Wesley Shields <wxs@atarininja.org>
Date:   Tue Jun 3 11:07:47 2014 -0400

    Fix screenshots.

commit 83fdfb93edd4260ee8a0b85d286ec2e216e23862
Author: Wesley Shields <wxs@atarininja.org>
Date:   Tue Jun 3 11:05:53 2014 -0400

    Minor cleanups.

commit 7b2640865a701d6e61fde459a749efcff2e54feb
Author: r3comp1le <infra917@gmail.com>
Date:   Tue Jun 3 07:13:55 2014 -0700

    Update README.md

commit 6b01eb961485db548a9f6e1fdef6c2ce4f1466d0
Author: r3comp1le <infra917@gmail.com>
Date:   Tue Jun 3 06:52:46 2014 -0700

    Update README.md

commit a633fe1ad0abc2fb43dce2c808391c1467377bc8
Author: r3comp1le <infra917@gmail.com>
Date:   Mon Jun 2 16:04:05 2014 -0700

    Update README.md

commit 6f74158310e9257f6d5ef72a569ea4daa74935b4
Author: r3comp1le <infra917@gmail.com>
Date:   Mon Jun 2 16:02:11 2014 -0700

    Update README.md

commit e5d8aa20d9618a31818e680a2a171ce116f43721
Author: r3comp1le <infra917@gmail.com>
Date:   Mon Jun 2 16:01:23 2014 -0700

    Update README.md

commit 4d03750d23afcb068cb990a17dccdaf8e3332736
Author: r3comp1le <infra917@gmail.com>
Date:   Mon Jun 2 13:56:19 2014 -0700

    Update README.md

commit 3bc66d2e39e8e7201ace57dd80041d4678063256
Author: r3comp1le <infra917@gmail.com>
Date:   Mon Jun 2 13:45:44 2014 -0700

    Update README.md

commit 64f9297d7331a2ce1594c95e2f615b7e4a2bfe65
Author: r3comp1le <infra917@gmail.com>
Date:   Fri May 30 17:17:51 2014 -0700

    Update README.md

commit 8a2a67e4abd304526537ded35f3e7e5c2a3ad688
Author: r3comp1le <infra917@gmail.com>
Date:   Fri May 30 12:24:31 2014 -0700

    Update README.md