Fix a possible null pointer
Merge pull request #1 from JavaMoney/master

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- Simplified/clarified ItemFormat.
- Added new extensions to monetary services.
- Added validation.
Fixed test that may fail depending on the current runtime locale.
Fixed test issues.
Adapted spi code.
Streamlined APIs/SPIs.
Added unsupported method for CashRounding.
Changed Eclipse cp.
Adapted API/SPI for validitites and currency access, including EDR feedback and streamlining.
Adapted API/SPI for validitites and currency access, including EDR feedback and streamlining.
Removed currency aspects from Region SPI.
Removed currency aspects from Region SPI.
- Removed CurrencyValidaityInfo with more general info class.
- Added additional accessors supporting Calendar instances.
- Updated JavaDoc script.
- Adapted spis.
Added some small utility methods.
Unified time representation in ExchangeRate and extensions validities.
Fixed some new bugs and adapted tests.
Unified validity apis for currencies and regions.
Aligned Region API with currencies.