Release 010

• add header and footer information for feedback and data requests
• force SSL in production to only accept HTTPS traffic, enable HSTS and secure tower cookies
• prevent concurrent sign ins
• Create Task model; fetch tasks from Contentful and create them in the database.
• Break direct association between Journey and Steps. Create new association between Tasks and Steps.
• Show Tasks on Journey page; clicking on a Task name takes you to a task page.
• Show Steps on Task page and allow users to answer questions from Task page
• fix CI not running RSpec
• existing specification page displays useful message when no specs exist
• fix text input field width to fit full screen width
• document where to find the service in the readme
• cache CI builds to reduce build times
• log information about contentful cache busting webhooks for debugging