Added Robinson wrapping for pcolormesh.
Wrap transform methods of Robinson projection to avoid passing NaNs.
Fixed support for 1d image regridding.
BUG: capture infinite loops creating LinearRings

Using current implementation, a multilinestring is used to construct
linestrings which include boundary points in order to make suitable
LinearRings, however, this can result in infinite loops as points are
determined by distance measures.

This fix maintains a list of linestring indices, ensuring that no
linestring can be re-added.
Merge pull request #277 from pp-mo/robinson_nans

Wrap transform methods of Robinson projection to avoid passing NaNs.
Fixed @rhattersley's lingering figure in test_set_extent.
Merge pull request #269 from cpelley/stop_inf_loop

BUG: capture infinite loops creating LinearRings
Merge pull request #281 from pelson/tidy_up_after_rhattersley

Fixed @rhattersley's lingering figure in test_set_extent.
Actions based on @esc24's review.
Merge pull request #278 from pelson/1d_spherical_gridding

Fixed support for 1d image regridding.
Merge pull request #272 from pelson/pcolormesh_for_robinson

Added Robinson wrapping for pcolormesh.
updated stereographic