Ckanclient

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* Form API added
* Package name editing
* Groups added
* Output can be verbose and use logger
* Query API version
* Sends API key via additional header

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* General usability improvements especially around error messages.
* Package Relationships added
* Package deletion fixed
* Changeset entities added
* Improved httpauth (thanks to will waites)

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* Search API support added
* Improved package support to include additional fields such as 'extras'
* Support tag and group entities in addition to package
* Compatibility changes: CkanClient base_location (now should point to base
api e.g. http://ckan.net/api rather than http://ckan.net/api/rest)

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* Fully functional implementation for REST interface to packages