feat(coords): allow both (left/x1) and (top/y1) attr keys

Author: vieron

src/jquery.coords.js

@@ -59,6 +59,9 @@
 
         var d = this.data;
 
+        typeof d.left === 'undefined' && (d.left = d.x1);
+        typeof d.top === 'undefined' && (d.top = d.y1);
+
         this.coords.x1 = d.left;
         this.coords.y1 = d.top;
         this.coords.x2 = d.left + d.width;