Added exchangeRate field to Currency model
Added new exchangeRate field to proper java classes
Added messages properties for exchangeRate field in Currency model
Added ExchangeRatesNbpService responsible for fetching and parsing xml from NBP
Fix letter case for EXCHANGE_RATE in CurrencyFields
Added ExchangeRatesUpdateService with methods invoked by scheduler
Added new filed exchangeRate to corresponding views
Price calculated accordingly to delivery currency
Fix copyright
Logging error instead printing stack trace
Changed fetched field name to 'kurs_sprzedazy'. Makes fieldName() abstract.
Update test
Changed Currency exchangeRate default value from 0 to 1
Fixing cron literals. Using quartz syntax.
Merge pull request #3 from asobiczewski/feature/exchangeRatesService

Feature/exchange rates service