test image permission
Regridding in projection space for vector plots.
Refined projection space regridding.
Merge pull request #366 from ajdawson/vector-transform-regrid

Regridding in projection space for vector plots.
Added streamplot method to GeoAxes.
Merge pull request #369 from ajdawson/streamplot

Added streamplot method to GeoAxes.
Correct behaviour of origin in imshow. Fixes #359.
Prevent image interpolation outside original domain. Fixes #358.
Added test for a regional image on a different projection.
Merge pull request #370 from ajdawson/imshow-bugfixes

Re-projecting non-global images and the origin keyword.
Reduced threshold for Stereographic projection.
Merge pull request #371 from ajdawson/stereographic-extent

Reduced threshold for Stereographic projection.
Correct wrapping and clipping of pcolormesh with IGH. Fixes #319.
Merge pull request #372 from ajdawson/igh-pcolormesh

Correct wrapping and clipping of pcolormesh with IGH. Fixes #319.
Improved testing of LambertConformal and Mercator.
Merge pull request #356 from pelson/remove_some_tests

Improved testing of LambertConformal and Mercator.
pep8 fix
Merge pull request #362 from marqh/testingImages

Test image permission.
Updated handling of 'global' to support v1.3
Made use of the hold_datalim context manager in stock_img.