add self variable if not defined and when running under node environment

src/Three.js

@@ -14,6 +14,14 @@ if ( typeof define === 'function' && define.amd ) {
 
 	module.exports = THREE;
 
+	// detects wheather self is not defined and uses global in node environment
+	if ( typeof self === 'undefined' ) {
+
+		// self gets hoisted!
+		var self = global;
+
+	}
+
 }