- fix several simple examples: these now force the <HTML> node to 100% height (and width), so that Reveal can calculate the correct viewport dimensions.

- added verge and response as submodules: when the user loads one of these, the viewportW/H functions of these libraries are used instead of the 100% width/height <HTML> approach. Based on info obtained via  http://stackoverflow.com/questions/1248081/get-the-browser-viewport-dimensions-with-javascript

- removed the head.js files as those will be replaced by the corresponding submodule.