Fixed the radio button name

The name for the property was only 'Yes'/'No', with this change
the options are displayed in a meaningful fashion.
Added Capybara
Integration for the form to the PDF form

Walks through filling in the form and generates the PDF
filled with the values provided
Using the data already defined under spec/support

That way only one set of test data is used throughout
the test suite
Really renamed landlord fields to claimant

It turns out that the fileds in the PDF form weren't renamed.
Made sure that they are renamed now.
Implemented PDF form comparison

Filled in a PDF form & saved it.
Comparing the pre-filled in form with the newly generated one.
Fixed the PDF form comparison

Using diff(1) as it seems to be the easiest option to implement
Merge pull request #36 from ministryofjustice/integration-test

Integration test