grib2 wind direction
nimrod biaxial projection -1
Updated to latests cartopy.
Refer travis to specific cartopy SHA.
Cartopy version dependency in INSTALL updated
new code-gen output (lic date)
Merge pull request #947 from dkillick/update_INSTALL_doc

Cartopy version dependency in INSTALL doc updated
Merge pull request #944 from pp-mo/cartopy_v10_candidate

Cartopy v10 candidate
Merge pull request #919 from marqh/maskLinearInterp

linear mask retention
Merge pull request #943 from marqh/testPPSave

ppsave test
Iris v1.6 whatsnew.
Merge pull request #917 from bjlittle/whats_new_1p6

Iris release v1.6 whatsnew.
Fixed issue with derived_phenomena example expecting colorbar object to
be a tuple.
Merge pull request #952 from esc24/derived_phenom_example_mpl131_support

Fixed mpl 1.3.1 issue with derived_phenomena example
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