Python-logstash-async

* Improve handling on locked Sqlite database on high event load

For details see https://pypi.python.org/pypi/python-logstash-async/1.1.1

- Add documentation (built by Sphinx, hosted at readthedocs.org)
- Fix installing of “six” dependency on package install

For details see https://pypi.python.org/pypi/python-logstash-async/1.1.0

Bugfix for 2.

For details see https://pypi.python.org/pypi/python-logstash-async/1.0.1

For details see https://pypi.python.org/pypi/python-logstash-async/1.0.0