adjust not permitted error message to be more appropriate

Author: dfenster

lib/notPermitted.js

@@ -2,6 +2,6 @@ var generateClass = require('./helpers/class-generator');
 module.exports = generateClass("NotPermittedError", {
   args: ['message', 'inner_error'],
   generateMessage: function(){
-    return "An attempt was made to perform an operation that is invalid: " + this.message;
+    return "An attempt was made to perform an operation that is not permitted: " + this.message;
   }
 })

tests/middleware/errorHandler.js

@@ -31,7 +31,7 @@ describe("errorHandler", function(){
     err = new errors.NotPermitted("don't do that");
     request.get('/error').end(function(err, res){
       assert.equal(res.res.statusCode, 403);
-      assert.equal(res.text, "An attempt was made to perform an operation that is invalid: don't do that");
+      assert.equal(res.text, "An attempt was made to perform an operation that is not permitted: don't do that");
       assert.ok(!console.error.called, "console.error not called");
       done();
     });

tests/not-permitted.js

@@ -1,4 +1,4 @@
 var support = require('./support');
 support.testError('NotPermittedError', {
-  message_to_assert: "An attempt was made to perform an operation that is invalid: test message"
+  message_to_assert: "An attempt was made to perform an operation that is not permitted: test message"
 });