Pyvo

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- Add a describe method to services to print a human-readable description.

- Use a customized user agent in http requests.

- Fix some python2/3 issues.

- Add general datalink processing method. [103]

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- Pass use_names_over_ids=True to astropy's to_table.

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- Make XML handling more generic.

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- Rework VOSI parsing using astropy xml handling. [88]

- Describe service object bases on vosi capabilities.

- Add SODA functionallity.

- Fixes and Improvements.

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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.