Some bug fixes and change in pattern

src/spkModel.js

@@ -1,14 +1,12 @@
 class SpkModel extends EventTarget{
-  constructor(url, storepath, id) {
+  constructor() {
     super()
-    this.obj = (async () => {
-      return new Module.__spkModel__(url, storepath, id, __genericObj__.objects.length)
-    })()
+  }
+  init(url, storepath, id) {
+    this.obj = new Module.__spkModel__(url, storepath, id, __genericObj__.objects.length)
     __genericObj__.objects.push(this)
   }
   delete() {
-    this.obj.then(() => {
-      this.obj.delete()
-    })
+    this.obj.delete()
   }
 }