Pyvo

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- Add Datalink interface.

- Put some common functionallity in Mixins.

- Minor fixes and improvements.

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- Using RegTAP as the only registry interface.

- Added a datamodel keyword to registry search.

- Using the six libray to address Python 2/3 compatibility issues.

- AsyncTAPJob is now context aware.

- Improvement upload handling; it is no longer necessary to specifiy the type
of upload.

- Allow astropy's SkyCoord and Quantity as input parameters.

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- Remove trailing ? from query urls. [78]

- VOTable fieldnames are now gathered from names only instead of ID and name.

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- Fix content decoding related error in async result handling.

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- Added a RegTAP interface. [73]

- Removed urllib in favor of the requests library. [74]

- Deprecated vao registry interface.

- Minor improvements and fixes.

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- Fix a bug where maxrec wasn't send to the server.