basic repairs
Refactpr tests to use DocFileSuite. The odd-ball approach I used before gave Python 3 heartburn.
Python 3 compatibility
make README.rst available in project root too.
Try to force travis to build, though maybe I need t make a PR.
https://github.com/zopefoundation/zc.recipe.filestorage/pull/1/files#r9714394
https://github.com/zopefoundation/zc.recipe.filestorage/pull/1/files#r9714552
Merge pull request #1 from zopefoundation/python3

Python3