Fleshing out MtGoxHistoric module tests

Signed-off-by: Dsyko <dsykora@gmail.com>
Adding trade fee enforcement

Signed-off-by: Dsyko <dsykora@gmail.com>
Adding check of account balance before executing trade.

Signed-off-by: Dsyko <dsykora@gmail.com>
Playing with historic trading

Signed-off-by: Dsyko <dsykora@gmail.com>