Encode uri to support utf8 chars

[RobinQu]

A filename, which is part of request URI in many APIs, is not necessary to be consisted of only English chars.

Considering support for such non-asci chars, we should encodeURI() before sending the request.

In fact, current implementation of storageUrl and cdnUrl really annoys me when uploading files with Chinese file names as the server responds no error but files are nowhere to be seen on the Cloudfile.

And the problem goes away with this fix.

[indexzero]

Sorry for the delay here! We've been waiting on all the issues / pull-requests for node-cloudfiles and node-cloudservers until we released pkgcloud: a new cross-provider unified IaaS library for node.js:

https://github.com/nodejitsu/pkgcloud
http://blog.nodejitsu.com/introducing-pkgcloud

We added a deprecation notice for this library, but would you consider reimplementing your pull-request for the Rackspace provider in pkgcloud? It would make you a HERO in my book 👍