remove unused Fragment

app/src/main/java/chat/rocket/android/fragment/server_config/WaitingFragment.java

-package chat.rocket.android.fragment.server_config;
-
-import android.os.Bundle;
-import android.view.View;
-import android.widget.TextView;
-
-import chat.rocket.android.R;
-import chat.rocket.android.helper.TextUtils;
-
-/**
- * Just showing "connecting..." screen.
- */
-public class WaitingFragment extends AbstractServerConfigFragment {
-
-  private String caption;
-
-  public WaitingFragment() {
-  }
-
-  /**
-   * create new "Waiting..." screen with caption.
-   */
-  public static WaitingFragment create(String caption) {
-    Bundle args = new Bundle();
-    args.putString("caption", caption);
-    WaitingFragment fragment = new WaitingFragment();
-    fragment.setArguments(args);
-    return fragment;
-  }
-
-  @Override
-  protected int getLayout() {
-    return R.layout.fragment_waiting;
-  }
-
-  @Override
-  protected void onSetupView() {
-    Bundle args = getArguments();
-    if (args != null) {
-      caption = args.getString("caption");
-    }
-
-    TextView captionView = (TextView) rootView.findViewById(R.id.txt_caption);
-    if (TextUtils.isEmpty(caption)) {
-      captionView.setVisibility(View.GONE);
-    } else {
-      captionView.setText(caption);
-      captionView.setVisibility(View.VISIBLE);
-    }
-  }
-}