Ddg

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* Fixed the error handling for printing results with special characters

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* When an exception is raised in the duckduckgo module, report the error
and then return None. This allows ddg.py to continue to the next query
rather than performing a sys.exit(1).
* Updated README
* Fixed formatting in LICENSE file
* Changed CHANGES to an rst file
* Updated the setup.py file
* Updated the help for all the input arguments

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* Changed the behavior of the -d flag. Rather than prefixing the query with
`define`, now just prioritize the definition result when searching for an
answer to the query.
* Updated README with more examples.

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* Added a new trove classifier and made code more PEP8 compliant

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* Fixed an issue with the -b prefix, please upgrade to the latest version
with pip install --upgrade ddg

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* Updated license to MIT