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.
BUG: non ccw polygon being interpreted

A workaround within cartopy is provided which changes the orientation
of a polygon if its exterior is of non counter-clockwise order.  The
order is important in cartopy while it isn't in matplotlib.  This is a
workaround for a bug present in mpl, as it is supposed to provide only
ccw polygons.
Merge pull request #280 from cpelley/ccw_fix

Fix non-ccw polygons when doing countourf.
Added the Globe class for better datum handling, and extended support to Stereographic.
Merge pull request #275 from bblay/polar_stereo

Add Globe class and extend parameter list for Stereographic.
Upgraded the Img class in cartopy.io.img_nest