Test images updated to reflect changes in MPL v1.3
Added snap=False to pcolor default args as mpl1.3 workaround
Updated license to reflect the new year
Updated cloud cover base image
Image updates where changes limited to axes positioning
Further image updates for axes postioning, pcolor snap changes
Images changed by Cartopy update
Final image changes
Example images changes
Deriving phenomena image changed following merge of #952
Matplotlib version in .travis.yml corrected to v1.3.1.
Changed default img tolerance in light of shift to mpl1.3
Removed custom tolerances
copyright updates
custom tolerance for atlantic profiles example
custom tolerance for test_cartopy_projection
Merge pull request #958 from esc24/img_tol_mpl131

Update to matplotlib 1.3.1 incl. img tolerance change