Add the Builder class for DocumentCollection
Apply builder to PlainTextparser
Apply DocumentCollaction builder into Textile parser
Apply DocumentCollaction builder into Textile parser
Apply DocumentCollaction builder into Markdown parser
Change parameter of ToFileContentSerializer constructor
Apply builder of DocumentCollection to ToFileContentSerializer
Remove member variable, currentSection in ToFileContentSerializer
Fix server build failure
Make DobumentGenerator.generate throw a exception
Extract generateDocument(String) to BasicParser and Fix checkstyle errors
Add comments to the public methods of DocumentCollection.Builder
Enhance error handling of DocumentCollection.Builder and add tests
Add logger to handle invalid validator names
Remove SentenceIterator from configuraitons
Merge pull request #168 from takahi-i/document-builder

DocumentCollection Builder
Merge pull request #172 from takahi-i/remove-iterator-config

Remove iterator config
Enhance tests adding a SectionValidator case
Divide validation process by Validator types
Merge pull request #176 from takahi-i/refactoring-documentvalidator

Refactoring documentvalidator