Added optional config parameter authUrl

Allows for the authUrl defined by pkgcloud to be overwritten. This is currently required to specify the correct URL to be used for UK cloudfiles
Updated Readme with UK account information
Merge pull request #7 from thomaswelton/master

Installation instruction typo
Updated this.data to config
Merge pull request #8 from thomaswelton/cloudfiles-uk

Rackspace UK support
Merge pull request #9 from thomaswelton/master

version bump