DATACMNS-377 - Prevent page sizes less than one.

PageRequest now actively prevents page sizes less than one. PageableHandlerMethodArgumentResolver falls back to default page size if it detects a page size less than one. It also rejects invalid default configuration using @PageableDefault.

src/test/java/org/springframework/data/domain/PageRequestUnitTests.java

@@ -94,4 +94,12 @@ public class PageRequestUnitTests {
 		// Does not equal on different size
 		assertNotEqualsAndHashcode(request, new PageRequest(0, 11));
 	}
+
+	/**
+	 * @see DATACMNS-377
+	 */
+	@Test(expected = IllegalArgumentException.class)
+	public void preventsPageSizeLessThanOne() {
+		new PageRequest(0, 0);
+	}
 }