Merge pull request #723 from ameetkini/ingestchanges

Rewrote Ingest to use Geotrellis warp/crop
Added RasterSource methods for Hydrology operations.
Merge pull request #724 from lossyrob/0.9.0-RC4/updates

Added RasterSource methods for Hydrology operations.
Created implicit class to collect DataSource results.
Removed networking code. See geotrellis-transit.
Added +,-,/,* to Raster
Added RasterSource methods for Hydrology operations.
Upgraded geotools version.
Merge pull request #727 from lossyrob/geotools-upgrade

Upgraded geotools version.
Merge pull request #725 from lossyrob/0.9.0-RC4/updates

Remove networking code
Merge pull request #726 from lossyrob/localOp-raster

Added +,-,/,* to Raster
fix bug in tileToExtent
add argument validation
Export: add single tiff option
Merge remote-tracking branch 'upstream/master' into exportchanges
add commnd line args validation