removes warnings unused atribuites, and dead codes
Merge pull request #31 from otaviojava/remove_unused_atribuites

removes warnings unused atribuites, and dead codes
Included concurrent bootstrap loading fix contributed by Jörn Horstmann, after made necessary changes.
Merge branch 'master' of https://github.com/JavaMoney/jsr354-api
JAVAMONEY-72: Harmonize Static Inner Builder classes with Builder
pattern/JDK 
Fixed JavaDoc
Task-Url: https://java.net/jira/browse/JAVAMONEY-72