Cleaned code with pylint and pep8, converted to requests library

Fix conversion to hours/minutes/seconds
Add pep8, pylint to travis-ci and setup.py
Fix pep8 and pylint errors
Fix python 3.x difference
Convert to use requests library

Current unit tests:
    % nosetests tests/unit/
    .........S.
    ----------------------------------------------------------------------
    Ran 11 tests in 7.069s

    OK (SKIP=1)

Conflicts:
	src/dogapi/stats/dog_stats_api.py