Retry

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* Updating requirements.txt to allow for any decorators >=3.4.2

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* Fix dependency issues with other packages caused by explicit dep verions in requirements

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* Add AUTHORS and ChangeLog files
* Packaging the application using PBR
* Update documentation
* Add retry_call function
* Update tox.ini
* Update requirements
* Move the tests to the appropriate package
* Add .gitignore file

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* v0.8.1
* Move try/import to compat

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* v0.8.0
* dos2unix
* Add argument jitter for retry()
* Add argument max_delay for retry()
* Refactor retry()

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* v0.7.0
* Update README.rst
* retry(): Update docstring
* retry(): Change default tries to -1
* Move decorator() to .compat
* Add test_tries_minus1()
* Add test_tries_inf()
* Mock time.sleep in test case
* Refactor retry()