public static void wtf(String tag, Throwable tr) {
        wtf(tag, null, tr);
    }
Prints a message at ASSERT priority.

@param tag Tag for for the log data. Can be used to organize log statements.
@param tr If an exception was thrown, this can be sent along for the logging facilities
          to extract and print useful information.
RecyclerView/Application/src/main/java/com/example/android/common/logger/Log.java