Change the prefix of sub modules from document-validator into redpen

- change sub module names
- change the names of result artifacts
Add "target" into .gitignore
Update README.md

Change the project name.
Update README.md

- capitalize P of RedPen :)
Replace document-validator into redpen in the file names and UIs

- replace command name from docvalid into redpen
- replace file names, documentvalidator.css (.js) to redpen.css (.js)
- replace document validator in UI.
Merge pull request #147 from takahi-i/rename-sub-modules

Great! Merged!
rename DVResource to Configuration
related #139
refactoring SentenceValidator constructor change Configuration to ValidatorConfiguration and CharacterTable, for remove SentenceIterator
introducing Factory class of SentenceValidator and SectionValidator
change SentenceValidator constructor to ValidatorConfiguration and CharacterTable instead of Configuration
minimum change Configuration to flatten
change class name to ValidatorConfiguration
move SentenceIteratorTest case to DocumentValidatorTest
fix no paragraph error bug
re-format code
remove SentenceIterator
add some Configuration test
add SentenceValidatorFactoryTest and SectionValidatorFactoryTest
use distributor in DocumentValidator
split illegal args test case
Merge pull request #153 from johtani/fix_cmd_app_148

Fix command line application
Merge pull request #150 from johtani/configuration_refactoring_139

Refactoring Configuration Structure
fix checkstyle error
Merge pull request #154 from johtani/fix_tiny_checkstyle_error

fix checkstyle error