Quality tools fixes

app/src/main/java/chat/rocket/android/api/rest/CookieInterceptor.java

 package chat.rocket.android.api.rest;
 
 import java.io.IOException;
-import okhttp3.*;
+import okhttp3.Interceptor;
+import okhttp3.Request;
 import okhttp3.Response;
 
 public class CookieInterceptor implements Interceptor {

app/src/main/java/chat/rocket/android/layouthelper/chatroom/AbstractMessageViewHolder.java

@@ -2,7 +2,6 @@ package chat.rocket.android.layouthelper.chatroom;
 
 import android.support.annotation.Nullable;
 import android.view.View;
-import android.widget.ImageView;
 import android.widget.TextView;
 
 import chat.rocket.android.R;