simple-cipher: add hint to @Ignore annotations

exercises/simple-cipher/src/test/java/SimpleCipherStepOneTest.java

         assertEquals(cipherText, cipherWithDefaultKey.encode("aaaaaaaaaa"));
     }
 
-    @Ignore
+    @Ignore("Remove to run test")
     @Test
     public void cipherCanDecode() {
         String cipherText = "aaaaaaaaaa";
         assertEquals(cipherText, cipherWithDefaultKey.decode(cipherWithDefaultKey.getKey().substring(0, 10)));
     }
 
-    @Ignore
+    @Ignore("Remove to run test")
     @Test
     public void cipherIsReversible() {
         String plainText = "abcdefghij";

exercises/simple-cipher/src/test/java/SimpleCipherStepThreeTest.java

     @Rule
     public ExpectedException expectedException = ExpectedException.none();
 
-    @Ignore
+    @Ignore("Remove to run test")
     @Test
     public void cipherKeyIsMadeOfLetters() {
         assertTrue(new Cipher().getKey().matches("[a-z]+"));
     }
 
-    @Ignore
+    @Ignore("Remove to run test")
     @Test
     public void defaultCipherKeyIs100Characters() {
         assertEquals(100, new Cipher().getKey().length());
     }
 
-    @Ignore
+    @Ignore("Remove to run test")
     @Test
     public void cipherKeysAreRandomlyGenerated() {
         String newKey = new Cipher().getKey();
                 "both returned key: " + newKey, newKey.equals(new Cipher().getKey()));
     }
 
-    @Ignore
+    @Ignore("Remove to run test")
     @Test
     public void cipherThrowsWithAllCapsKey() {
         expectedException.expect(IllegalArgumentException.class);
         new Cipher("ABCDEF");
     }
 
-    @Ignore
+    @Ignore("Remove to run test")
     @Test
     public void cipherThrowsWithAnyCapsKey() {
         expectedException.expect(IllegalArgumentException.class);
         new Cipher("abcdEFg");
     }
 
-    @Ignore
+    @Ignore("Remove to run test")
     @Test
     public void cipherThrowsWithNumericKey() {
         expectedException.expect(IllegalArgumentException.class);
         new Cipher("12345");
     }
 
-    @Ignore
+    @Ignore("Remove to run test")
     @Test
     public void cipherThrowsWithAnyNumericKey() {
         expectedException.expect(IllegalArgumentException.class);

exercises/simple-cipher/src/test/java/SimpleCipherStepTwoTest.java

         cipherWithSetKey = new Cipher(key);
     }
 
-    @Ignore
+    @Ignore("Remove to run test")
     @Test
     public void cipherKeepsTheSubmittedKey() {
         assertEquals(key, cipherWithSetKey.getKey());
     }
 
-    @Ignore
+    @Ignore("Remove to run test")
     @Test
     public void cipherThrowsWithEmptyKey() {
         expectedException.expect(IllegalArgumentException.class);
         new Cipher("");
     }
 
-    @Ignore
+    @Ignore("Remove to run test")
     @Test
     public void cipherCanEncodeWithGivenKey() {
         String cipherText = "abcdefghij";
         assertEquals(cipherText, cipherWithSetKey.encode("aaaaaaaaaa"));
     }
 
-    @Ignore
+    @Ignore("Remove to run test")
     @Test
     public void cipherCanDecodeWithGivenKey() {
         String cipherText = "aaaaaaaaaa";
         assertEquals(cipherText, cipherWithSetKey.decode("abcdefghij"));
     }
 
-    @Ignore
+    @Ignore("Remove to run test")
     @Test
     public void cipherIsReversibleGivenKey() {
         String plainText = "abcdefghij";
         assertEquals(plainText, cipherWithSetKey.decode(cipherWithSetKey.encode("abcdefghij")));
     }
 
-    @Ignore
+    @Ignore("Remove to run test")
     @Test
     public void cipherCanWrapEncode() {
         String cipherText = "zabcdefghi";
         assertEquals(cipherText, cipherWithSetKey.encode("zzzzzzzzzz"));
     }
 
-    @Ignore
+    @Ignore("Remove to run test")
     @Test
     public void cipherCanEncodeMessageThatIsShorterThanTheKey() {
         String cipherText = "abcde";
         assertEquals(cipherText, cipherWithSetKey.encode("aaaaa"));
     }
 
-    @Ignore
+    @Ignore("Remove to run test")
     @Test
     public void cipherCanDecodeMessageThatIsShorterThanTheKey() {
         String cipherText = "aaaaa";
         assertEquals(cipherText, cipherWithSetKey.decode("abcde"));
     }
 
-    @Ignore
+    @Ignore("Remove to run test")
     @Test
     public void cipherCanDoubleShiftEncode() {
         String plainText = "iamapandabear";