Added test to check reading of ESRI produced geotiff.

Added a failing test to read an ESRI generated geotiff (with NoData value 0) and match it against an Arg that was created by reading in that geotiff with geotrellis.gdal.GdalReader. 

Note: MustMatchers is deprecated since we upgraded scalatest, use org.scalatest.Matchers...I changed to 'should' matchers witch resolved some weird error and is more consistent with whats mostly used in the code base.