Update restler to patched version (#45)

* Update restler dependency

Restler looks to be abandoned so we'll need to eventually rewrite the client.
Until then we're using a forked version that has the known vulnerabilities
patched.

* Update test call

* Revert to an older version of nodeunit

New versions of nodeunit don't support the versions of node that we want to
continue to support.

* Update readme

* Update link

* Update Readme

* Update URL

Author: demoore

README.md

@@ -196,7 +196,10 @@ api.send({
 
 ```javascript
 var api = require('sendwithus')('API_KEY');
-api.customersUpdateOrCreate({ email: '[email protected]', data: { name: 'Bob' } }, callback);
+api.customersUpdateOrCreate({
+    email: '[email protected]',
+    locale: 'fr-CA'
+}, callback);
 ```
 
 ### Delete a Customer
@@ -395,7 +398,7 @@ npm test
 
 ### Enable Debug Mode
 
-Debug mode prints out the underlying request information as well as the data payload that gets sent to Sendwithus. You will most likely find this information in your logs. To enable it, simply put `debug=true` as a parameter when instantiating the API object. Use the debug mode to compare the data payload getting sent to [Sendwithus' API docs](https://www.sendwithus.com/docs/api "Official Sendwithus API Docs").
+Debug mode prints out the underlying request information as well as the data payload that gets sent to Sendwithus. You will most likely find this information in your logs. To enable it, simply put `debug=true` as a parameter when instantiating the API object. Use the debug mode to compare the data payload getting sent to [Sendwithus' API docs](https://support.sendwithus.com/docs/api "Official Sendwithus API Docs").
 
 ```javascript
 var api = require('sendwithus')('API_KEY', debug=true);

package.json

@@ -1,6 +1,6 @@
 {
   "name": "sendwithus",
-  "version": "4.3.0",
+  "version": "4.3.1",
   "author": "Sendwithus <[email protected]>",
   "description": "Sendwithus.com Node.js client",
   "main": "index.js",
@@ -29,7 +29,7 @@
     "transactional"
   ],
   "dependencies": {
-    "restler": "~3.4.0"
+    "restler": "git://github.com/sendwithus/restler#3.1.1"
   },
   "devDependencies": {
     "nodeunit": "^0.9.1"