1264 Add @SInCE annotations.

Author: Richard Blaylock

api/src/main/java/com/stormpath/sdk/oauth/OAuthStormpathFactorChallengeGrantRequestAuthentication.java

@@ -23,6 +23,9 @@
  */
 public interface OAuthStormpathFactorChallengeGrantRequestAuthentication extends OAuthGrantRequestAuthentication {
 
+    /**
+     * @since 1.5.0
+     */
     String getState();
 
     String getChallenge();

impl/src/main/java/com/stormpath/sdk/impl/oauth/OAuthStormpathFactorChallengeGrantAuthenticationAttempt.java

@@ -40,6 +40,8 @@ public interface OAuthStormpathFactorChallengeGrantAuthenticationAttempt extends
      * Method used to set the state token referencing a challenge to be verified.  Typically this token will have come
      * in response to a previous OAuth token request.
      * @param state the state token referencing the challenge to be verified.
+     *
+     * @since 1.5.0
      */
     void setState(String state);