azavea/geotrellis — pull request #265 by joshmarcus (2012-12-10 21:55:43+00:00)
Title: Improve error messaging and handling of raster loading.

This pull request improves the error messaging of the raster load operations. It also adds some supporting mechanisms: catalogs store their source path and json, and there are new methods that return StepOutput[Raster] instead of Raster.