fix amdclean npm package version for hassle free minification

Hi, I had some trouble with minification on my app. After I looked at things, I realized that I had an older amdclean. After changing this package.json setting to the 2.x series, my minification worked just right. It's a cool framework, I like it a lot & it's a pretty good teaching tool as well. 

You might want to look at bumping some of those other package versions as well, I'm not too familiar with them.