Refactoring gallery trail
Adding AB test
Adding tracking name
Only track as page event if fired from a trailblock
Fix tests
Initialise lightbox when in variant
Target all gallery thumbsheets, not just trails
Hide ab variant by default
Move gallerythumbs styles to their own file
Merge branch 'master' into ab-inline-galleries
Correcting classnames
Adding doc for A/B test
Removing styles (moved to separate file)
ENsure that tracking is enabled on the thumb links
Change classname (again)
In Swipe mode, tap goes to next image
Merge pull request #1357 from guardian/ab-inline-galleries

A/B Inline galleries