patch for #issue/38, remove duplicate currencies
patch for #issue/38, remove duplicate currencies

RubyMoney/money,pixeltrix/money,BrandyMint/money,maicoin/money,gregoryhappyfresh/money,paulodiniz/money,printercu/money,nilbus/money,envato/money,bonusly/money,kewaunited/money,bnmrrs/money,insphire/money,saizai/money,richardvenneman/money,AlexVPopov/money,antstorm/money