AuthorityLookup returns nil not false when nothing found
Added failing test for mapit data missing snac
Search filters put into left column for tablet and desktop views

- added divs to allow column floats
- CSS for columns
- CSS copied from Whitehall for styling
- image asset copied from Whitehall
Wording changes to search filter

worked with @AmyWhitney
fix scrolling behaviour on search filter

- when the department filter is used on search pages, the page no
longer jumps back to the top
- JS change by @edds
- dependancy on
https://github.com/alphagov/static/commit/5438b01d529e625118b19461f55d93
30becee683
Patch styling bug with search filter in non-js desktop view
Pass minimum_should_match feature flag to rummager
Add error message when postcode does not have relevant snac code
Properly pass minimum_should_match flag through

I had only passed it through for government results. Now it gets passed
through for mainstream and detailed results as well.
Allow features to be disabled explicitly on preview

We're enabling features by default on preview, but sometimes we might
want to explicitly disable one to compare the behaviour both with and
without the feature.
Search: additional whitespace above filter submit button
Searh, change 'what we do' rich org link to point at #topics
Merge pull request #354 from alphagov/search-org-metadata-fix

Search, change 'what we do' rich org link to point at #topics
put external link search results in grey box

so that they look ok in mobile search results
fix search tabs in mobile view

stops the tabs sliding underneath each other in narrow viewports
Ignore organisation filtering for top results.
Avoid duplicated top results in filtered searches.

Because we were using a separate, unfiltered list to extract top results from
filtered searches, the code to remove the duplicates wasn't working because it
compared results by identity. Determining result equality by whether they have
the same link solves this.
scope search styles to containing <section> element

to stop style bleeding out to the .search class also placed on the body
element
Add metadata and summary info more Inside Gov search results

- add 'corporate information' metadata tag and result summary to
corporate information results
- add 'document series' attribute to document series result
Merge pull request #355 from alphagov/search-filter-fixes

Search filter fixes