Rename QualityTests to QualityTest

Maven will only execute unit tests whose class name begins or ends with
"Test".

Author: awalter17

src/test/java/net/imagej/ops/image/quality/QualityTests.java renamed to src/test/java/net/imagej/ops/image/quality/QualityTest.java

@@ -45,7 +45,7 @@
  *
  * @author Stefan Helfrich (University of Konstanz)
  */
-public class QualityTests extends AbstractOpTest {
+public class QualityTest extends AbstractOpTest {
 
 	Img<ByteType> reference;
 	Img<ByteType> test;