Restauthcommon

* Update installation instructions

ContentHandlers
* Implement the XMLContentHandler
* Add the Pickle3ContentHandler for Pickle protocol version 3.
* The librarypath attribute may now refer to submodules
(i.e. 'lxml.etree' instead of just 'lxml')
* Update documentation, add a few additional testcases

* Various python3 compatability fixes
* Rename content handlers to standard python camel case:
* json --> JSONContentHandler
* xml --> XMLContentHandler
* form --> FormContentHandler
Old names are still available for now.
* Two new ContentHandlers: PickleContentHandler and YamlContentHandler
* Add a requirements.txt file
* Add a minor test-suite to test the import feature.
* Remove unused (and python2 specific) unmarshal_unicode method
* FromContentHandler is now almost fully implemented but does not
support nested dicts.
* Add the setup.py coverage target.
* add various new identifiers for pypi.
* Add useful requires directive to install pyyaml
* Switch from distutils to distribute, enables automatic installation of
dependencies (pyyaml).

* New exception 'Forbidden' for requests that throw HTTP status 403 Forbidden
* Adhere to python coding standards
* Update Copyright notices (some files still contained 'Foobar' as a program name)
* All python source code is now pep8 clean
* Cleanup: Remove old methods RestAuthCommon.marshal and
RestAuthCommon.unmarshal.

* Catch ValueErrors from json library and wrap them in an UnmarshalError/MarshalError
* setup.py now cleans *all* generated files
* fix setup.py file in Python3 file (previously it threw an exception)
* Handle version in a more consistant manner
* This package is now included in PyPI
* Use the most compact JSON representation

* Initial version based on version 0.5 of the RestAuth protocol.