* Added ugrid module. Defines NetcdfField class for constructing netcdf files.
* Added ugrid module. Defines NetcdfField class for constructing netcdf files.

== Added ==

* ugrid module define NetcdfField base class used for construting netcdf files
  that conform to the ugrid/cf-conventions. Subclass this class to construct
  files that define different grid types. For instance: rectilinear,
  structured, unstructured, etc.



csdms/coupling,csdms/pymt,csdms/coupling