Ported bug fix for Hades #425 - PageRequest should reject 0 page size.

Applied patch provided by Stevo Slavic, thanks!

spring-data-commons-core/src/main/java/org/springframework/data/domain/PageRequest.java

@@ -72,7 +72,7 @@ public class PageRequest implements Pageable {
                     "Page index must not be less than zero!");
         }
 
-        if (0 > size) {
+        if (0 >= size) {
             throw new IllegalArgumentException(
                     "Page size must not be less than or equal to zero!");
         }

spring-data-commons-core/src/test/java/org/springframework/data/domain/PageRequestUnitTests.java

@@ -43,6 +43,13 @@ public class PageRequestUnitTests {
     }
 
 
+    @Test(expected = IllegalArgumentException.class)
+    public void preventsZeroSize() {
+
+        new PageRequest(0, 0);
+    }
+
+
     @Test
     public void equalsRegardsSortCorrectly() {