Add filter for word count

Author: addyosmani

filter-wordcount.js

@@ -0,0 +1,10 @@
+/**
+ * Calculates word-count for a given string
+ * @param  {string} str
+ * @return {integer}
+ */
+PolymerExpressions.prototype.wordcount = function(input){
+	var words = (input) ? input.match(/\w+/g) : null;
+    return (words) ? words.length : null;
+}
+