Rename package to dohq_confluence

[allburov]

PyCharm can add missing imported package to setup.py or requirements.txt file automaticly .

If package name is dohq-confluence in pypi, but from confluence import Confuence, PyCharm can't do it.

Name confluence also used in other confluence-python package:

1. https://pypi.python.org/pypi/Confluence-py/1.0.1
2. https://pypi.python.org/pypi/confluence

So, we need rename package to dohq_confluence

DoD:
User can from dohq_confluence import Confuence