Generate Problems Pseudorandomly from seed

[hkloom]

use Phill's random js library to generate challenges of varying difficulty (from a seed)

depending on the size of the seed value, we generate levels of increasing difficulty.
one idea:

1. choose a solution based on the current tools available in our toolbelt and the ratio of obstacles / goals we want
2. place balls and goals so that they match the solution we picked
3. place obstacles around the board while checking that the solution picked is still valid