Fixed image of Jade in README.

The comparison of Jade vs. Blade had the wrong image for Jade, so I fixed it.
Fixed image of Jade in README.

The comparison of Jade vs. Blade had the wrong image for Jade, so I fixed it.
Adjust comparison headers.

With the new image, I needed to adjust the headers to make them pretty.
Adjust comparison headers (again).

More adjusting of the header text is necessary.
Merge pull request #124 from martindale/master

Fixed Jade image in the README.