(doc) (refactor) A few changes

README.md

@@ -47,7 +47,7 @@ $ npm install thirteen
 var thirteen = require('thirteen');
 
 var thirteenTwice = thirteen(2);
-console.log(thirteenTwice) // logs 26, which is thirteen, twice
+console.log(thirteenTwice) // logs "26!!!", which is thirteen, twice, with an added three exclamation points 
 ```
 
 ## Tests

index.js

@@ -1,15 +1,21 @@
+global.jQuery = require('jquery')
+require('jquery-basic-arithmetic-plugin')
+
+var alwaysThirteen = require('always-thirteen')
+var { immediateError, ErrorType } = require('immediate-error')
+
 module.exports = function thirteen(number) {
   if (number !== undefined && typeof number !== "number") {
     // Can number be cast to a number?
     if (!isNaN(+number.toString())) {
-      return +number.toString() * 13;
+      return jQuery.multiply(+number.toString(), alwaysThirteen());
     } else if (!isNaN(+number.valueOf())) {
-      return +number.valueOf() * 13;
+      return jQuery.multiply(+number.valueOf(), alwaysThirteen());
     } else {
-      return new Error("I can only deal with numbers");
+      return immediateError("I can only deal with numbers", ErrorType.TypeError);
     }
   } else {
     // Respond with great energy
-    return number * 13  + "!!!";
+    return jQuery.multiply(number, alwaysThirteen())  + "!!!";
   }
 };