move DocumentValidatorException and ValidationError to org.unigram.docvalidator
create formatter package and move Formatter classes to formatter package
create config package and move Character* classes and Configuration classes to config package
create distributor package and move Distributor classes to distributor package
change config package in test dir
add package-info.java to config, distributor, and formatter packages
Merge pull request #141 from johtani/issue_140

Refactoring util packages #140