Bump travis ruby version from 2.1.2 -> 2.1.5
start page updates

- new layout
- new copy
- added CSS classes for panel and button
- updated tests
Merge pull request #508 from ministryofjustice/fix/update-travis-ruby-version

Bump travis ruby version from 2.1.2 -> 2.1.5
updates: copy, css

- mobile css
- refactor on scss buttons
- new colour var
- updated copy
CSS tweaks
Merge pull request #509 from ministryofjustice/front-end/new-startpage

start page updates
GA tracker module

- initial JS
Updates: JS, Aside partial

- new methods for errors on pages
- implemented data tags on aside page
- WIP
Updates: links, JS
Merge branch 'front-end/ga-virtual-page-views' of github.com:ministryofjustice/atet into front-end/ga-virtual-page-views
Updates: Start page