Wrote actual README.
Added ignored messages to jsh.handleMessage (Runtime.enable, etc).
Added back-end, moved crap around, implemented basic save/load.

* Back-end designed to run on Google AppEngine.
* Moved all the frotnend stuff to the ~public/~ directory.
* jsh.save and jsh.loadFromText implemented. Simple stuff.

The next step is writing a UI for save, figuring out what needs to be done
about ~console.clear~, and uploading.
Fixed wrapObject-related bug.
Added save button.
Loading jessions now works.

Also added the favicon route and inlined some scripts.
Did crap with history.replaceState. That's fancy.