Energy grants calculator - April 6 changes

logic changes
new options to two questions
copy changes
Married couple's allowance - April 6 changes

Updates to a published smartanswer for April 6th. Don't merge yet.
Updating logic and adding new outcome

dding outcome
Adding logic to take user to new outcome
Updating test for social housing tenant

Updating test for social housing tenant & income support with child
under 16
Updated to make uprating happen automatically

Reworked flow
Added timecop tests
Make April 6th changes be done through Timecop

This makes the April 6th changes happen automatically, and doesn't rely
on us doing a midnight deploy or anything like that.
Update to tests

updated timecop tests
Change smart quote to single apostrophe
tweaking tests

reworking timecop tests slightly
final tweakery of tests
fixing link to Form E
Merge pull request #262 from alphagov/calculate-married-couples-allowance

Married couple's allowance - April 6 changes
Merge pull request #260 from alphagov/energy-grants-calculator

Energy grants calculator - April 6 changes
making GOV.UK links relative rather than absolute
Update links that are no longer external
Merge pull request #281 from alphagov/fix-irish-passport-form-e

fixing link to Form E