Rackspace Cloud Files action

First version of a Rackspace Cloud Files action. It can upload file(s) to the configured Rackspace Cloud Files account. It also needs a container name which will be configured when the first file is uploaded. In order to reconfigure the container you can click on the action. Files CDN URLs are copied to clipboard after upload.
Added configurable region and CDN

The region is now configured by the user. Also he can choose to enable or disable CDN if a new container is created. Added more messages to show status while the action is executed. Added check for the URL, if it's empty or not.
Merge pull request #8 from alexchiri/master

Rackspace Cloud Files action