Added singular test-suite to run all the tests in the imgscalr release;

makes it easier to vet for release.

src/test/java/org/imgscalr/AllTests.java

@@ -0,0 +1,12 @@
+package org.imgscalr;
+
+import org.junit.runner.RunWith;
+import org.junit.runners.Suite;
+import org.junit.runners.Suite.SuiteClasses;
+
+@RunWith(Suite.class)
+@SuiteClasses({ ScalrApplyTest.class, ScalrCropTest.class, ScalrPadTest.class,
+		ScalrResizeTest.class, ScalrRotateTest.class })
+public class AllTests {
+	// no-op
+}