Fix travis and appveyor continuous integration

The Python 2.7 builds are bombing:

ImportError: No module named 'setuptools'

changed title from [travis] add setuptools to requirements.txt to [travis] set PYAV_PYTHON correctly for Python 2.7

changed title from [travis] set PYAV_PYTHON correctly for Python 2.7 to Fix travis and appveyor continuous integration

mentioned in issue #220 (closed)

Merged by: mikeboers at 2018-09-19 15:50:17 UTC

closed