Adding @ericmmartin's SimpleModal

Adding @ericmmartin's SimpleModal.

I got the libraries from the links on http://www.ericmmartin.com/projects/simplemodal/. The actual download is at http://code.google.com/p/simplemodal/downloads/detail?name=jquery.simplemodal.1.4.4.min.js&can=2&q=

GitHub numbers are decent (https://github.com/ericmmartin/simplemodal) but so are the download numbers on Google Code (http://code.google.com/p/simplemodal/downloads/list) - almost 350k downloads of this version.