Bump rails to 4.1.4

This picks up the latest security fixes.
Merge pull request #28 from alphagov/bump-rails-to-4.1.4

Bump rails to 4.1.4
Validate requests against GOV.UK SSO using tokens
Merge pull request #29 from alphagov/sso-integration

Token-based authentication using GOV.UK SSO
Send a minimal manual to the content store
Send maximal manuals to the content store

This now adds base_path to child sections.
Separate content store concerns from the input