There is lack of CORS (XHR proxy) support for certain HTTP verbs.

This (presumably) adds support for the rest of the verbs, which were
left out when the proxy was re-written :-( (there definitely could have
been more testing in place for this, alas, resources..).

This fixes GitHub issue:

https://github.com/blackberry/Ripple-UI/issues/693

lib/server/proxy.js

@@ -132,7 +132,7 @@ function jsonpXHRProxyHandler(req, res/*, next*/) {
 function start(options, app) {
     var corsOptions = {
         origins: ["*"],
-        methods: ['HEAD', 'GET', 'POST'],
+        methods: ['HEAD', 'GET', 'POST', 'PUT', 'DELETE', 'TRACE', 'CONNECT'],
         credentials: true,
         headers: []
     };