Test to reproduce an issue that occurs with python3.3 under macos10 only

This test passes fine under linux
Merge pull request #1313 from al-tonio/frenchdate

Test to reproduce problem with Python 3.3+ on Mac OS X only
move {ARTICLE,PAGE}_DIR -> {ARTICLE,PAGE}_PATHS

Instead of one path a list can be given. This is due to popular request.
Should help people not wanting to use Pelican for blogging.
Maintain backward compatibility though.