TmsTiling: add overloaded tileToExtent method
Cleanup: renamed "path" to "pyramid" or "raster" where it made sense
added test files to geotrellis-spark/src/test/resources
TestEnvironement: initial commit
switch tests to using TestEnvironment
TileIdPartitioner: suppress spurious println
TileIdPartitioner: renamed 'pyramid' to 'raster' in API
Added unit test for Ingest
RasterReader: initial commit