f54ccb9 allow from_compose by CID, use get_release, update fedfind dep

Authored and Committed by adamwill 8 years ago
    allow from_compose by CID, use get_release, update fedfind dep
    
    fedfind get_release() now handles URLs and CIDs, and the
    get_release_cid() and get_release_url() functions are only
    thin wrappers for backwards compat, so stop using them here
    so I can remove them in future. Also allow specifying the 'from'
    release by compose ID as well as URL, and update the fedfind
    requirement in setup.py.
    
        
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