adjustment of DocumentValidatorServer
Renamed Document to DocumentCollection
Add .gitignore
Renamed FileContent to Document
added back .gitignore
Renamed package store to model.  Other minor renames.
Proposing various renames.  Let's discuss and revert if we don't like the new naming.
Removed lang.ja package
Removed lang.ja package
Split SentenceValidator interface into two interfaces by moving initialization to SentenceValidatorInitializer (will be removed later on)
Split Validator interface into two interfaces by moving configuration loading to ConfigurationLoader (will be removed later on)
Remove ResultDistributor from validator interface. Temporarily trickle it into place using an ad-hoc setter to be removed later on.
Renamed DocumentValidator to RedPenCore (naming could likely change, but DocumentValidator will become and interface perhaps).  Introduced SectionValidator and started aligning validators to document model.
Removed local classes for section tests.
Starting-point for programmatically creating DocumentValidator
Update CONTRIBUTORS.md

i made the authors as a list.
change maxlinelength to 100
fix #134
Merge pull request #137 from johtani/change_checkstyle_no134

change maxlinelength to 100
Work-in-progress refactoring
Refactoring

- making initialize and loadValidators part of constructor
- replacing iterator based loops with iterable
- fixing tests
- other minor refactorings