Registers an extension with this Ruby plugin so that it will be found later on
This method is generally called from inside Ruby, as objects that implement
extension points register themselves.
When stapler is querying a Java object to see which properties it has
it normally uses reflection to see if there is a field or getter with the
corresponding name which it can use.
Initializes this plugin by setting up the JRuby scripting container
and then loading up the ruby side of the plugin by creating an
instance of the Ruby class Jenkins::Plugin which will serve as
its agent in the Ruby world.
Jenkins will call this method whenever the plugin is initialized
The plugin will in turn delegate to its instance of Jenkins::Plugin
which can take action on the Ruby side.
Jenkins will call this method whenever the plugin is shut down
The plugin will in turn delegate to its instance of Jenkins::Plugin
which can take action on the Ruby side