SciTools/cartopy — pull request #495 by QuLogic (2014-10-10 21:07:34+00:00)
Title: Make OWSLib optional on Python 3

It seems like OWSLib might have a ways to go before it gets Python 3 support, whereas Cartopy is nearly ready _now_. So this PR makes OWSLib fully optional for Python 3 by:
* Deferring import errors from import time up to the point where classes depending on OWSLib are used.
* Skip OWSLib tests on Python 3