Model collection attribute updates in the form of a complete object replacement in the collection is now supported
Location file API needs to load location file when requested by its associated slug
Reorganized some functions into common_object.  Fixed some edge cases with loading the location file.
Reorganized and refactored the location code a bit.
Added NetCDFOutput object API
Added the GeoJson outputter object API
location api needed to perform its work inside a semaphore lock.  Added Tests for nested Model.spills.
Merge branch 'master' of https://trac.orr.noaa.gov/git/WebGnomeAPI