Store Foreman Settings in the database and allow configure it using the WebUI/API
Provide a mechanism to allow a user to have specific settings associated with them. This will supersede the current SETTINGS hash and allow overriding on a per user, per-model basis.
The idea is that there is a per_page setting at the system level, a per_page setting at the model level for each user and this should also allow for saving things like the user's search history and preferences.
fixes #100 - Setting is now a ActiveRecord object
This allows users to manage foreman settings via the UI.
the UI is a bit ugly, but works :)