* Drop py34 support
* Travis experiments
* More Travis experiments
* Bump Twisted version for py35+ (stretch)
* Remove Debian build
* Remove pinned lxml for Py34
* Fix merge error
* Remove unused tox env
* Add environment with pinned versions for py36
* Bump minimum Twisted version in py27; Envs with pinned versions for py27 and py35
* Add botocore as extra dep for py27 tests
* Update requirements-py2.txt
* Add botocore and Pillow as extra dependencies
* rename requirements.txt to requirements-py2.txt, to make it clear they are Python 2-only
* make requirements-py3.txt consistent with requirements-py2.txt