Householding: Add tests (and move to a rule?)

[curtismorales]

There should be a set of test for householding logic.

It also probably makes sense to move householding into a ruleset of its own and out of the ApplicationProcessor code.

[curtismorales]

@colinxfleming let me know if you have questions.

[colinxfleming]

@curtismorales sounds good on tests. Specifically, we're looking for tests of the methods determine_household, calculate_household_size, and calculate_household_income right? Am I leaving anything out?

w/r/t moving the householding stuff (just those three methods above?) to a rule-style, it would probably make it way more testable for sure. I'll take a whack at it this week.

[curtismorales]

Yes to everything. Those three methods. And I think moving it to a rule-style is a good first step.