Added GDAL based raster reader

Co-authored by Jacob Becker <jacob.becker@kitware.com>. This reader support
a variety of rster formats using GDAL library

Change-Id: I9bc4dac89e271f307de70e86f0b50604d6229926
Fixed various minor issues

Change-Id: Iee65eba1254d6b7c6ad16072641fd405bc34a874
Added baseline and data for the testing

Change-Id: I67d54fb02b381f5c8b5a1d5dfdc245f741395b0e
Addressed minor code clean up issues

Change-Id: I620be35bdc580d7c59eb479f5070ea6ea45be0e8
Fixed various cleanup issues

Change-Id: Ie03440f350fd2e4add1c6f9f29d5e85e43762454
Merge topic 'geovis_raster_reader' into master

61e7f03d Fixed various cleanup issues
7f9c70a7 Addressed minor code clean up issues
2cd1a322 Added baseline and data for the testing
781d1b5d Fixed various minor issues
2de16eeb Added GDAL based raster reader