adding a 'raster' that is just a text file to test for the case where data are corrupt

git-svn-id: svn://scm.naturalcapitalproject.org/svn/invest-test-data@78 a1e471e8-3ae1-4eeb-aa86-f41caf2650e8

habitat_quality/bad_rasters/small_crp_c.tif

+"bad data"