Update in Forex broker list

I've added information about ECN (Electronic Communication Network) broker - MB Trading. It’s an interesting Forex broker, which is a very good for those traders that are quite experienced in Forex trading and want to introduce themselves to ECN Forex trading (which is a kind of 'more real' trading). This broker has a low minimum deposit amount of $400. Some minor changes have also been brought to Forex brokers section - to Deutsche Bank FOREX, FXCM (thanks to Luis Gonzaga) and Marketiva (about withdrawal commission almost gone).