Continued work on local op methods for refactor
Merge in upstream
Merge remote-tracking branch 'upstream/master' into localOpMethods
Merge remote-tracking branch 'upstream/master' into localOpMethods
Many changes to the infrastructure regarding Raster and RasterData
Created zonal operations using new DataSource methods.
Modifications to unit tests.
Fixed CostDistanceSpec
Modified all local operations to work with new DataSource architecture.
Merge pull request #607 from lossyrob/localOpMethods

Local op methods