Fix issue where results were being displayed before they should be
Fix test for ANI calculator form.
Fix issue when updating values in ANI calculator

The calculator values were being ignored when the adjusted_net_income
field was filled in.  This meant that if you updated any values in the
calculator, it wasn't updating the adjusted_net_income value unless you
first cleared it.

This changes it so that it will always calculate the adjusted_net_income
if any of the fields in the calculator form are filled in.
Merge pull request #37 from alphagov/fixes_and_copy_updates_2

Fixes for a couple of logic bugs.