Nested Attribute Code Smells with PT/PL/MP

There seems to be some needless hackery here.

There was a bug for ProblemLevel#new -- we were previously unable to add a problem level to an empty ProblemType. The current fix is to explicitly build a new problem level for the problem type (@problem_level.problem_type.problem_levels.build) in ProblemLevel#create. Shouldn't be necessary, but without it, we get a ProblemType can't be blank error, even through level.problem_type reference seems fine.
ProblemType currently expliclity initializes problem levels. ( before_validation :initialize_problem_levels, :on => :create, in ProblemType model.) Seems like this shouldn't be necessary.

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