Re: [jclouds] Refactored OpenStack pagination. Removed Rackspace pagination. Prefer PaginationOptions. (#191)

[Everett Toews]

@demobox Care to have a look at this? I was planning on committing in the next 
hour or two.

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https://github.com/jclouds/jclouds/pull/191#issuecomment-27006359