creation of books medium relevance component
Revert "Merge pull request #4382 from guardian/revert-pull-request-4381"

This reverts commit d9227ca2dfa630e5cf6fe703c5488809595d2e38, reversing
changes made to 071544d6f5bf607f0195ddf277d726533e6be148.
URLencode SVG
adding text fallback for search forms
Book feeds can have explicit books shortlisted.

First pass at this feature.
Made param less explicit.

Makes it easier to put in other places.
spacefinder
mobile ad placement
spacefinder tests
Set Component Max Age
renaming splacefinder
removing excess padding for travel component
Merge branch 'master' into commercial-comp-bugs
Show more replies work again on renderComments
Cache Book Offers
Cache Job Offers
don't load in advert if forcing commercial component
Cache Masterclasses
Merge pull request #4549 from guardian/show-replies-bugfix

Show more replies work again
Cache Money Offers