FirebaseApp is expected to return a mutable list of apps; Hiding a co… (#11)

* Hiding a couple of internal members in Query * Returning immutable List from FirebaseApp.getApps()

Author: hiranya911

src/main/java/com/google/firebase/FirebaseApp.java

@@ -82,7 +82,7 @@ private FirebaseApp(String name, FirebaseOptions options, TokenRefresher.Factory
  tokenRefresher = checkNotNull(factory).create(this);
  }
 
- /** Returns a mutable list of all FirebaseApps. */
+ /** Returns a list of all FirebaseApps. */
  public static List<FirebaseApp> getApps() {
  // TODO(arondeak): reenable persistence. See b/28158809.
  synchronized (appsLock) {

src/main/java/com/google/firebase/database/Query.java

@@ -640,6 +640,7 @@ public Path getPath() {
  /**
  * <strong>For internal use</strong>
  *
+ * @hide
  * @return The repo
  */
  public Repo getRepo() {
@@ -649,6 +650,7 @@ public Repo getRepo() {
  /**
  * <strong>For internal use</strong>
  *
+ * @hide
  * @return The constraints
  */
  public QuerySpec getSpec() {