Revert "update plone.app.event plip buildout"

This reverts commit b522911069732b055e221349e6f4bf80063c64ec.
Revert "remove git checkout branch-fixes"

This reverts commit 71bc54b6d605f965828c9ed0f5f586ef85d04404.
Revert "add plone.app.event test eggs"

This reverts commit 5682ceb1a9a634b769116fb9e7c84957c6cf5008.
Revert "add plone.app.event sources"

This reverts commit 3e4eaee3bdcadfb0452fbabc7222dae951343768.