Cubes update

[kpreid]

Some new features in Cubes:

• An automated test suite. It’s hardly complete coverage, but at least it exists and so can grow. (I ended up going with Jasmine for in-browser testing. I’m not a big fan of the Englishy syntax, but it does the job reasonably well and has niceties like rerunning individual tests and adequate support for asynchronous tests.)
• Precise collision against rotated blocks: you can now walk up the slope of those funky pyramid blocks, and so on. Stairs, anyone?
• Performance monitoring widget with fancy graphs. (If you click the “[-]” to hide it, then it won’t waste CPU time updating itself, either.)