Update classroom and gameplay Ux to surface practice levels as 3a, 3b,
etc.
Update next level logic to leverage practice levels based on per level
completion playtime thresholds.
Patrol buster and patrol buster A are live for testing.
Fix a few classroom Ux progress hover bubble info bugs.
Closes#3767
* Initial pass adding new game-dev level type.
* Fix a failing test with updated LevelSystem required properties
* Bring back normal Angel worker timeout times
* Fix another failing LevelSystem test since removing propertyDocumentation
Fix typo
Fix race condition with loading next level
Return an empty object for next level instead of an error;
Supermodel has a race condition when some of the models fail to load,
when we override an error response as "success".
Fix next level spec
Remove comment per Scott's request
* Updates spade.js vendor file, adds a sublime-project for developers to use
* Moves server logic away from handlers
* Moves session update logic to middleware, sets up server schema to autorender IDs as ObjectIDs
* Modernizes the supermodel loading scheme and switches from constructor to initalize
As JavaScript is the only language supported by the beautifier, and [CodeCombat is in the process of converting things to while (true)](https://github.com/codecombat/codecombat/issues/3510#issuecomment-201965310), I guess adding this quick hack to the view's code should suffice for now. Hopefully, the non-standard `loop` construct will be removed from other languages before they receive beautifier support.
If this doesn't seem good, I can move this hack to `aether.beautify`, where it is possible to perform this substitution in a language-aware way (i.e. inside Aether's JavaScript implementation's [`beautify` method](418ccf2414/src/languages/javascript.coffee (L137))). Seeing as the `loop` construct is specific to CodeCombat, I'm not sure if that would be a good idea. Passing an options object with a flag to support the `loop` construct seems a bit overkill.
Let me know what works best for you.
