Merge remote-tracking branch 'upstream/master' into XWIKI-9693
Merge remote-tracking branch 'upstream/master' into XWIKI-9693
XWIKI-9693: When creating a subwiki, the Activity Stream should be empty.

* Add WikiProvisioningEvent, WikiProvisionedEvent and WikiProvisioningFailedEvent.
* TemplateWikiProvisioningJob now notifies these new events.
* XARImportingEvent implements now BeginFoldEvent (so that the importing of a XAR does not make events in the AS anymore).
Merge remote-tracking branch 'upstream/master' into XWIKI-9693
Merge pull request #211 from gdelhumeau/XWIKI-9693

XWIKI-9693: When creating a subwiki, the Activity Stream should be empty.