js : Add isLaidOut prop for no animation on first layout

src/jquery.isotope.js

@@ -304,7 +304,8 @@
 
       // are we animating the layout arrangement?
       // use plugin-ish syntax for css or animate
-      var styleFn = ( this.applyStyleFnName === 'animate' && !$.data( this.element, 'isotope' ) ) ? 
+      
+      var styleFn = ( this.applyStyleFnName === 'animate' && !this.isLaidOut ) ? 
                     'css' : this.applyStyleFnName,
           animOpts = this.options.animationOptions;
 
@@ -325,6 +326,8 @@
         callback.call( $elems );
       }
       
+      this.isLaidOut = true;
+
       return this;
     },