Fix a Typo ConvertBigDecimal#DEFAULT

Fix a typo in `org.javamoney.moneta.spi.ConvertBigDecimal#DEFAULT`.
Merge pull request #54 from marschall/ConvertBigDecimal-typo

Fix a Typo ConvertBigDecimal#DEFAULT
fixed JAVAMONEY-80
reformatted file according to checkstyle rules
Merge pull request #55 from cm-rudolph/JAVAMONEY-80

fixed JAVAMONEY-80