Merge pull request #518 from morrme/patch-5

simple-linked-list: add hint to @Ignore annotations

exercises/simple-linked-list/src/test/java/SimpleLinkedListTest.java

         assertThat(list.size(), is(0));
     }
 
-    @Ignore
+    @Ignore("Remove to run test")
     @Test
     public void canCreateFromArray() {
         Integer[] values = new Integer[]{1, 2, 3};
         assertThat(list.size(), is(3));
     }
 
-    @Ignore
+    @Ignore("Remove to run test")
     @Test
     public void popOnEmptyListWillThrow() {
         thrown.expect(NoSuchElementException.class);
         list.pop();
     }
 
-    @Ignore
+    @Ignore("Remove to run test")
     @Test
     public void popReturnsLastAddedElement() {
         SimpleLinkedList list = new SimpleLinkedList();
         assertThat(list.size(), is(0));
     }
 
-    @Ignore
+    @Ignore("Remove to run test")
     @Test
     public void reverseReversesList() {
         SimpleLinkedList list = new SimpleLinkedList();
         assertThat(list.pop(), is(5));
     }
 
-    @Ignore
+    @Ignore("Remove to run test")
     @Test
     public void canReturnListAsArray() {
         SimpleLinkedList list = new SimpleLinkedList();
         assertEquals(list.asArray(Integer.class), expected);
     }
 
-    @Ignore
+    @Ignore("Remove to run test")
     @Test
     public void canReturnEmptyListAsEmptyArray() {
         SimpleLinkedList list = new SimpleLinkedList();