Added MPL version check to matplotlib.path.wedge workaround
Removed axes from test_cloud_cover to make test mpl version agnostic
Wedge fix based on behaviour not on mpl version
Review actions - tests on vertices writeable flag
Merge pull request #936 from dkillick/mpl_path_wedge

Updated wedge fix in symbols.py
Modifications to interpolate.py for move to SciPy 0.13.2