1.8.7 release
1.8.7 release

mpoehler/gradle-appengine-plugin,GoogleCloudPlatform/gradle-appengine-plugin,MGronber/gradle-appengine-plugin,judeebene/gradle-appengine-plugin,loosebazooka/gradle-appengine-plugin,ArseniKavalchuk/gradle-appengine-plugin