Renamed createService to registerCurrencyPair in ExchangeService.
Optimized imports.
Optimized imports.
Moved README.md to org/multibit/exchange/domain
Removed extraneous registerCurrencyPair method from ExchangeService
Removed unused constructor from RegisterCurrencyPairCommand.
Added CurrencyPairTests and moved domain.model related tests from exchange.domain to exchange.domain.model package.
Added logic to uppercase all currency symbols.
Removed DuplicateOrderException - will add it back when it comes up in tests.
Minor test code clean-up.
Cleaned up domain.model.Exchange
Cleaned up domain.model.ExchangeId
Added more robust set of tests around ItemPrice creation.