-+ Added HttpMessage::fromEnv(int type[, string class_name = "HttpMessage"]) (Clay Loveless)
-+ Added --enable-http-persistent-handles (Clay Loveless)
+o Improved new persistent handles functionality
+ - Removed --enable-http-persistent-handles
+ + Added http.persistent.handles.limit system INI option which controls
+ the maximum amount of idle persistent handles kept around (per provider);
+ 0 means every handle is destroyed after usage (i.e. disabled),
+ -1 means virtually unlimited maximum amount of idle handles (default)