add new mockups using extjs instead of bootstrap

mockup2 is just a node-webkit wrapper around the extjs desktop example with most of the unnecessary files removed. run the build.sh command in mockup2 to get app.nw and run it using nw.

mockup3 is an attempt to recreate the mockup similar to that from bootstrap except that the extjs ui seems a little cheesy but the transitions make the idea more animated. building is similar to mockup2. need to add one more step after loading finishes to transition to the "most-used" screens. that's coming up next. stay tuned ...