Changing dev support ad

Tweaks & renaming developer support ad
Merge pull request #119 from gocardless/change-job-ads

Changing dev support ad
Tweaks to engineering job ads
Removing leavers from about page

Andrew, Dominik & Astrid
Merge pull request #121 from gocardless/removing-leavers

Removing leavers from about page
Fix typo
Merge pull request #120 from gocardless/change-job-ads

Tweaks to engineering job ads
Adding SVG icons
Changing gym member icon
Added new customer icon to membership page
renamed the vertical-page__hockey-bg (etc) to story-hero__spencer-hockey (etc)
tidied up the flow of text on gyms and sports clubs pages, so that it flows more nicely across lines of text on the story hero
Adding svg-icon--small etc
Merge branch 'new-splash-pages' into new-svg-icons
Merge pull request #194 from gocardless/new-pro-typos

Pro page typos
Adding tick-xsmall icon
Fixing margin for tick-xsmall icon in stories
Fixed site wrappers across 6 pages
fixed site wrapper, and removed unused ng-init div for videos
fixing indentation