@Remove
    some class the final key word

@Add
    PhPUnitTests
Merge remote-tracking branch 'origin/master'
@Remove
    some class the final key word
@Update
    Currency.php >> change $this->_row to self::$_row it is static property
    adapt CurrencyTest

@Add
    PhPUnitTests
Merge remote-tracking branch 'origin/master'