created putBusinessPlan method in SharedPreferencesUtility.java

ideally this will allow us to save the user's business plan to SP so we
can access it throughout the app.

It is not functional at this point.
added attribute Integer household to BusinessPlan.java

the number of people in the client's household is now part of the
constructor. There are methods to get and set.
edited the addSharedPreferences method

Now, this method calls putBusinessPlan in SharedPreferencesUtility.

The app is crashing when initBusinessPlan() is called (via onClick of
the next button)