Validate with an ignored property scope
allow ignoring a scope during validation
Require concrete class to list plugins

* allow ignored scope for validation
extend getFrameworkPropertyResolver

* allow including instance configuration properties
Use pluginService in NotificationService

* configure NotificationPlugins at all scopes
* validate NotificationPlugins only at instance scope
fix saveAndExec: include notificationPlugins
Add tags for generating plugin prop config names
Out-of-scope notification plugin property info

shown to admin authorized users
Update plugin configuration methods

* return a map containing instance and extra configuration
* needed to support extra scopes for notification plugins
Support scopes in groovy plugin config definitions
Support scoped properties for groovy Notification plugins
Update notification plugin dev docs

* include scoped property information
Rename example groovy Notification plugins directory
Fix github links to example code
Merge pull request #445 from gschueler/feature/443-notification-plugin-scopes

Feature: notification plugin scopes for #443