Fix a bunch of broken exercises :(

Module code isn't guaranteed to be loaded in any particular order. There can be $.fn.<modulename>Load() functions that are executed after all the code is loaded which is the proper place to do util module initialization.

Test plan: http://localhost:8000/utils/test/kmatrix.html http://localhost:8000/utils/test/kvector.html and some problematic exercises locally to sanity check things are still working. I'm not aware of a way to repro this in a local environment, so the real test will be on staging.

Auditors: alex, jack