queen-attack: add hint to @Ignore annotations

exercises/queen-attack/src/test/java/QueenAttackCalculatorTest.java

         assertFalse(calculator.canQueensAttackOneAnother());
     }
 
-    @Ignore
+    @Ignore("Remove to run test")
     @Test
     public void testQueensCanAttackOnTheSameRank() {
         final QueenAttackCalculator calculator
         assertTrue(calculator.canQueensAttackOneAnother());
     }
 
-    @Ignore
+    @Ignore("Remove to run test")
     @Test
     public void testQueensCanAttackOnTheSameFile() {
         final QueenAttackCalculator calculator
         assertTrue(calculator.canQueensAttackOneAnother());
     }
 
-    @Ignore
+    @Ignore("Remove to run test")
     @Test
     public void testQueensCanAttackOnFirstDiagonal() {
         final QueenAttackCalculator calculator
         assertTrue(calculator.canQueensAttackOneAnother());
     }
 
-    @Ignore
+    @Ignore("Remove to run test")
     @Test
     public void testQueensCanAttackOnSecondDiagonal() {
         final QueenAttackCalculator calculator
         assertTrue(calculator.canQueensAttackOneAnother());
     }
 
-    @Ignore
+    @Ignore("Remove to run test")
     @Test
     public void testQueensCanAttackOnThirdDiagonal() {
         final QueenAttackCalculator calculator
         assertTrue(calculator.canQueensAttackOneAnother());
     }
 
-    @Ignore
+    @Ignore("Remove to run test")
     @Test
     public void testQueensCanAttackOnFourthDiagonal() {
         final QueenAttackCalculator calculator
         assertTrue(calculator.canQueensAttackOneAnother());
     }
 
-    @Ignore
+    @Ignore("Remove to run test")
     @Test
     public void testCoordinateWithNegativeRankNotAllowed() {
         expectedException.expect(IllegalArgumentException.class);
         new BoardCoordinate(-2, 2);
     }
 
-    @Ignore
+    @Ignore("Remove to run test")
     @Test
     public void testCoordinateWithRankGreaterThan7NotAllowed() {
         expectedException.expect(IllegalArgumentException.class);
         new BoardCoordinate(8, 4);
     }
 
-    @Ignore
+    @Ignore("Remove to run test")
     @Test
     public void testCoordinateWithNegativeFileNotAllowed() {
         expectedException.expect(IllegalArgumentException.class);
         new BoardCoordinate(2, -2);
     }
 
-    @Ignore
+    @Ignore("Remove to run test")
     @Test
     public void testCoordinateWithFileGreaterThan7NotAllowed() {
         expectedException.expect(IllegalArgumentException.class);
         new BoardCoordinate(4, 8);
     }
 
-    @Ignore
+    @Ignore("Remove to run test")
     @Test
     public void testNullCoordinateNotAllowed() {
         expectedException.expect(IllegalArgumentException.class);
         new QueenAttackCalculator(null, new BoardCoordinate(0, 7));
     }
 
-    @Ignore
+    @Ignore("Remove to run test")
     @Test
     public void testQueensMustNotOccupyTheSameSquare() {
         expectedException.expect(IllegalArgumentException.class);