Renamed aus_dem.tif to aus_dem.tiff. Top level pom file lists *.tiff
as test resource, but not *.tif. This fixes a test error: "Could not
load aus_dem.tif from scope class
org.geoserver.wms.worldwind.BilTest."
Fixed (most) of the failing tests in the BIL module. Changed test to
use GeoServerTestSupport.getBinary to retreive response body. This
avoids interpreting the buffer as character content, which was causing
the length of the returned array to differ from the expected result.
Changed expected content length for application/bil test to match
expected length for application/bil16. Expected behavior is for the
plugin to maintain the native byte encoding when application/bil is
requested, which is application/bil16 for the test file.
Merge pull request #774 from parkerabercrombie/fix_bil_tests

Fix DDS/BIL plugin tests