Renamed method as per the proposed API (firebase#109)

Author: hiranya911

src/main/java/com/google/firebase/auth/FirebaseAuth.java

@@ -486,7 +486,7 @@ public Void call() throws Exception {
    * @throws IllegalArgumentException If the user ID string is null or empty, or the claims
    *     payload is invalid or too large.
    */
-  public ApiFuture<Void> setCustomClaimsAsync(String uid, Map<String, Object> claims) {
+  public ApiFuture<Void> setCustomUserClaimsAsync(String uid, Map<String, Object> claims) {
     return new TaskToApiFuture<>(setCustomClaims(uid, claims));
   }
 

src/test/java/com/google/firebase/auth/FirebaseAuthIT.java

@@ -322,7 +322,7 @@ public void testCustomClaims() throws Exception {
 
       Map<String, Object> expected = ImmutableMap.<String, Object>of(
           "admin", true, "package", "gold");
-      auth.setCustomClaimsAsync(uid, expected).get();
+      auth.setCustomUserClaimsAsync(uid, expected).get();
 
       // Should have 2 claims
       UserRecord updatedUser = auth.getUserAsync(uid).get();
@@ -341,7 +341,7 @@ public void testCustomClaims() throws Exception {
       }
 
       // Should be able to remove custom claims
-      auth.setCustomClaimsAsync(uid, null).get();
+      auth.setCustomUserClaimsAsync(uid, null).get();
       updatedUser = auth.getUserAsync(uid).get();
       assertTrue(updatedUser.getCustomClaims().isEmpty());
     } finally {