accessability fixes
Replace static scheme results with Imminence data

Update gds-api-adapters to eliminate duplicate result bug.
Simplified parameter requirements of Scheme.lookup().
Implement filtering of scheme results

* Text for checkboxes changed after conversations with Liz and Amy.

* Updated Capybara to get access to page.assert_selector.
* Moved integration tests for Capybara upgrade because Capybara only
  includes 'visit' etc in features/ in this version.
* Upgraded rspec to latest to get the gds_api helpers to be included
  following the Capybara upgrade.
updated css and html header on start page. Updated paragraph copy. CSS of zero results
css changes to button
Removed big class from button, unneeded. Removed 100% width.
Cool, seems my prototype code is good enough for production :) Gets the thumbs up from Mr Byers.
Indentation & whitespace