Json-schema-validator

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* New major release, incompatible with past releases
* Drop everything apart from schema validator as other elements have lost their significance
* Tweak requirements to support current Ubuntu LTS (10.04 aka Lucid)
* Refresh installation instructions to point to the new PPA, provide links to
lp.net project page and pypi project page.

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* Change how setup.py finds the version of the code to make it pip install okay
when simplejson is not installed yet.

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* Fix another problem with pip and versiontools (removed unconditional import
of versiontools from __init__.py)

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* Fix installation problem with pip due to versiontools not being available
when parsing initial setup.py

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* Change name to json-schema-validator
* Add dependency on versiontools
* Register on pypi
* Add ReST documentation

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* Add support for retrieving default values from the schema