Engine: Fixes 3345: Adding katello to rabl paths.
Engine: engine-actkeys - page displays but missing proper path to assets
Engine: Basic oldpane rendering.

Updated commit based on feedback from ehelms.
Engine: Fixing ability to set remote_id and save the user object.
Engine: Update paths for some common assets (e.g. alchemy, fonts...)
Engine: Activation Keys: changes to support CRUD actions
Engine: remove the absolute namespacing for HttpResource
Engine: add namespacing to KTEnvironment reference
Engine: engine-sysgroup - fixes #3329

System group creation and editing works except for
+ Content -> Packages
+ Content -> Errata
Engine: Fixes #332: Enabling Sync Plans page.
Engine: fixes #3257 - seed.rb added to migration
Engine: fixes #3381 - change username/email to Foreman column names login/mail