i232: ensure osr will properly raise exceptions

Closes #232.
i247: allow shapefile path to be used in addition to key

A path may now be passed to ShpCabinetIterator in addition to
OcgOperations for the "geom" argument.

Closes #247.
i231: generate demonstration code for geoweb integration

Initial example code for netCDF conversion to GeoJson.
Update release.org
version changes
Merge branch 'master' of https://github.com/NCPP/ocgis
doc changes.
Merge branch 'master' into i155-seasonal

Conflicts:
	src/ocgis/api/parms/definition.py