Explain Publishing API requirement

With the move to use the content store, a bunch of steps were needed to
get the App running the first time round if you hadn't done a data sync
recently. This commit adds a section in the README to explain what to
do.
Remove code that generates little x links

User research shows us that nobody ever clicks the small 'x's that are used to clear the facet criteria, so we're going to remove them and see if anybody notices.
This commit removes the code that builds the x and the links.
Remove unused scss

We're not using this css since we've removed the little xs from search descriptors
Make sure value labels are html_escaped
Merge pull request #110 from alphagov/explain-publishing-api-requirement

Explain Publishing API requirement
Merge pull request #117 from alphagov/remove-tiny-xs

Remove tiny xs
Replace proxy with bind

As per https://github.com/alphagov/finder-frontend/issues/49, the frontend toolkit now has a bind shim for older browsers, so we can use bind instead of $.proxy to pass `this` context into functions. Hurrah!
Merge pull request #112 from alphagov/use-bind

Replace proxy with bind
Update gds-api-adapters
Redirect the user to the correct govdelivery topic signup page

Depending on the choices the user has chosen, find the correct subscriber list
and send the user there.