Added stopOrder method to the Strategy class to place stop orders.
Added marketOrder method to the Strategy class to place market orders.
Added limitOrder method to the Strategy class to place limit orders.
Added stopOrder method to the Strategy class to place stop orders.
Added stopLimitOrder method to the Strategy class to place stop limit
orders.
Changed the order of the stopPrice and limitPrice parameters in
Strategy.enterLongStopLimit, Strategy.enterShortStopLimit and
Position.exit.