Make EVL dashboard more generic.
Use dashboard controller for LPA and HMRC.
Converted FCO dashboard to use generic dashboard.
Rename dashboard to slug, for the generic dashboard
Extract available services from common_controller and dashboard_services
to a Rails configuration.
Convention to have a view directory per dashboard slug.
Move view away from Service class.
Load list of services from a configuration file at config/services.yml.
Simplify service parsing by using index_by.
Newline for OCD / cleaner future diffs
Add Services class + tests for app config

@phss, @gtrogers
Initialise services and feature toggles together.

@gtrogers, @phss
Merge branch 'master' into refactor-rails-controllers
Merge pull request #146 from alphagov/refactor-rails-controllers

Refactor rails controllers