Commited fix and test from cm-rudolph for JAVAMONEY-78.
AssertTrue changed to assertEquals (fix from cm-rudolph).
add parser methods to all MonetaryAmounts implementations
add more information in javadocs.
using MonetaryAmountFormat
make GroupMonetarySummaryStatistics public
Merge pull request #42 from otaviojava/parser_monetary_amount

add parser methods to all MonetaryAmounts implementations