misc: Update author information

Author information was added to any file
with the standard license text.
Authors were added that added/changed >= 3%
of the lines of a file.
diff --git a/tests/image_tests.cpp b/tests/image_tests.cpp
index 0ff00af..24206f7 100644
--- a/tests/image_tests.cpp
+++ b/tests/image_tests.cpp
@@ -48,6 +48,10 @@
 //  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 //  FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
 //  DEALINGS IN THE SOFTWARE.
+//
+// Author: Courtney Goeltzenleuchter <courtney@LunarG.com>
+// Author: Jon Ashburn <jon@lunarg.com>
+// Author: Tony Barbour <tony@LunarG.com>
 
 
 // Verify VK driver initialization