Generified LocaleConvertUtilsBean.

Again, it is not possible to go very far in applying meaningful type
parameters. For instance, for the convert() methods it does not seem to be
possible to use a type parameter for the result type as the target type is
changed dynamically based on some criteria.

git-svn-id: https://svn.apache.org/repos/asf/commons/proper/beanutils/branches/java5@1537270 13f79535-47bb-0310-9956-ffa450edef68