udpated compiled chai.js and added to browser tests

chai.js

@@ -100,6 +100,20 @@ var AssertionError = require('./error')
 
 module.exports = Assertion;
 
+/**
+  * # Assertion.includeStack
+  *
+  *     Assertion.includeStack = true;  // enable stack on error
+  *
+  * User configurable property, influences whether stack trace
+  * is included in Assertion error message. Default of false
+  * suppresses stack trace in the error message
+  *
+  * @api public
+  * 
+  */
+Assertion.includeStack = false;
+
 /*!
  * # Assertion Constructor
  *
@@ -134,7 +148,7 @@ Assertion.prototype.assert = function (expr, msg, negateMsg) {
     throw new AssertionError({
       operator: this.msg,
       message: msg,
-      stackStartFunction: this.ssfi
+      stackStartFunction: (Assertion.includeStack) ? this.assert : this.ssfi
     });
   }
 };

test/browser/index.html

@@ -11,6 +11,7 @@
     <script src="../should.js"></script>
     <script src="../assert.js"></script>
     <script src="../plugins.js"></script>
+    <script src="../assert-config.js"></script>
     <script>onload = function() {
       mocha.run();
     }