Surface Test: Temp Calibration Stairs (Customizable)

Test how nice the top surface is with various temperatures.

After making [my version of a calibration tower](http://www.thingiverse.com/thing:915435). I realized I could easily reuse much of that code to make other box-based calibrations. And realized that tower is only testing edge surfaces and minor overhangs. This was my first idea, mainly for testing surface quality (the filament we got seemed to have the most issues with that being consistent)

Disclaimer: The photographs here are a