Add a CACHE MANIFEST file.

As per http://www.html5rocks.com/en/tutorials/appcache/beginner/ .
Add the CACHE MANIFEST file to the tops of my HTML files.

Again, see http://www.html5rocks.com/en/tutorials/appcache/beginner/ .
Merge pull request #14 from WarriorIng64/add-caching-stuff

Attempt to add caching stuff