Merge pull request #475 from morrme/ignorepalprod

palindrome-products: add hint to @Ignore annotations

exercises/palindrome-products/src/test/java/PalindromeCalculatorTest.java

     }
 
     @Test
-    @Ignore
+    @Ignore("Remove to run test")
     public void largestPalindromeFromDoubleDigitFactors() {
         final List<List<Integer>> expected = Collections.unmodifiableList(
                 Arrays.asList(
     }
 
     @Test
-    @Ignore
+    @Ignore("Remove to run test")
     public void smallestPalindromeFromDoubleDigitFactors() {
         final List<List<Integer>> expected = Collections.unmodifiableList(
                 Arrays.asList(
     }
 
     @Test
-    @Ignore
+    @Ignore("Remove to run test")
     public void largestPalindromeFromTripleDigitFactors() {
         final List<List<Integer>> expected = Collections.unmodifiableList(
                 Arrays.asList(
     }
 
     @Test
-    @Ignore
+    @Ignore("Remove to run test")
     public void smallestPalindromeFromTripleDigitFactors() {
         final List<List<Integer>> expected = Collections.unmodifiableList(
                 Arrays.asList(