Added contentWindow file as part of the bower package

bower.json

@@ -6,7 +6,7 @@
     "David J. Bradshaw <[email protected]>"
   ],
   "description": "Keep same and cross domain iFrames sized to their content with support for window/content resizing, multiple and nested iFrames. (Dependacy free and works with IE8+)",
-  "main": "js/iframeResizer.min.js",
+  "main": ["js/iframeResizer.min.js", "js/iframeResizer.contentWindow.min.js"],
   "keywords": [
     "CrossDomain",
     "Cross-Domain",