v0.7.0

🚀🚀🚀

ChangeLog:

• update docs for tag 0.7.0
• test against more python versions in tox and travis
• fix test error
• fix pep8 error
• 🚨 (Maybe Incompatible) Added auth tuple to the get request. Work with 6.0.6.1
• update tox command in README
• remove travis check for python 2.6
• upgrade tox and travis python version to 3.5
• fix #115: OrderedDict mutated during iteration
• test against py34 instead of py33
• Pep8 is dead, long live pycodestyle
• fix unicode error when removing empty elements
• fix #96: escape xml post data
• fix bug on empty children ids: #95
• fix issue #92: Authentication not working for bad login in 6.0.3
• fix issue #90: item type identifier
• fix RuntimeError: OrderedDict mutated during iteration on Python 3
• fix issue #88: workitem creation bug
• add slack badge
• fix issue #86: keyword capitalize error
• remove broken PyPI downloads badge and add saythanks badge