js : Use $.extend for cellByRow layout

src/jquery.molequul.js

@@ -613,14 +613,16 @@
 
   // ====================== cellsByRow ======================
   
-  $.Molequul.prototype._cellsByRowReset = function() {
+  $.extend( $.Molequul.prototype, {
+
+    _cellsByRowReset : function() {
       this.cellsByRow = {};
       this._getCols('cellsByRow');
       this.cellsByRow.rowHeight = this.options.cellsByRow.rowHeight || this.$allAtoms.outerHeight(true);
       return this;
-  };
+    },
 
-  $.Molequul.prototype._cellsByRowLayout = function( $elems ) {
+    _cellsByRowLayout : function( $elems ) {
       var instance = this,
           cols = this.cellsByRow.cols;
       this.cellsByRow.atomsLen = $elems.length;
@@ -633,13 +635,13 @@
         instance._pushPosition( $this, x, y );
       });
       return this;
-  };
+    },
 
-  $.Molequul.prototype._cellsByRowGetContainerSize = function() {
+    _cellsByRowGetContainerSize : function() {
       return { height : Math.ceil( this.cellsByRow.atomsLen / this.cellsByRow.cols ) * this.cellsByRow.rowHeight + this.posTop };
-  };
+    },
 
-  $.Molequul.prototype._cellsByRowResize = function() {
+    _cellsByRowResize : function() {
       var prevCols = this.cellsByRow.cols;
       this._getCols('cellsByRow');
 
@@ -648,7 +650,10 @@
         this.reLayout();
       }
       return this;
-  };
+    }
+  });
+  
+