Sparqlwrapper

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- Updated return formats for not content negotiation situations
- Included license in the MANIFEST (issue 76)
- Added explicit support for RDF/XML as allowed format (issue 75)
- Added proper shebang (issue 78)
- Moved keepalive as optional dependency (issue 79)
- Fixed hash check on prefixes (issue 77)
- Fixed epydoc warnings (issue 41)

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- Removed wrong response encoding (issue 70)
- Authorization header bug when using Python 3 (issue 71)

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- Removed pip dependency on setup (issue 69)

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- Fixed packaging (issue 66)

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- Finally fixed the keepalive issue in all Pyhon versions (issue 65)
- Removed old JSON layer in favor of the native json module

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- Moved to the new keepalive package (issues 53 and 61)