Ckanclient

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* Default URL changed from thedatahub.org to datahub.io

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* Add support for CKAN's Action API
* GET methods now send API key too
* Removed changeset functions
* Added a script for creating a CSV dump of a CKAN instance
* Add support for uploading files to the CKAN FileStore via the Storage API
* Add support for uploading data files to the CKAN DataStore via the
Data API (merge datastore-client into ckanclient)

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* Default URL changed to thedatahub.org
* Guard against 301 redirection, which loses POST contents

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* More detailed exceptions added
* Some Python 3 compatibility

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* Package search returns results as a generator
(rather than a list that needs to be paged)

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* Exception raised on error (more Pythonic)