Adding SVG icons
Changing gym member icon
Added new customer icon to membership page
Adding svg-icon--small etc
Merge branch 'new-splash-pages' into new-svg-icons
Adding tick-xsmall icon
Fixing margin for tick-xsmall icon in stories
Adding security svg icon
Merge pull request #190 from gocardless/new-svg-icons

Adding SVG icons - DO NOT MERGE