0.1.0

Initial version of gridspec. Compliant with ESMF gridspec file definitions. Includes support for the following grids:

• gnomonic cubed-sphere (see: gridspec-create gcs --help)
• stretched gnomonic cubed-sphere (see: gridspec-create sgcs --help)
• regular lat-lon grid (see: gridspec-create latlon --help)
  • pole-centered/polar-edge and dateline-centered/dateline-edge
  • regional lat-lon grid