first implementation markdown parser
change test doc
add sample-doc for markdown
Merge branch 'master' into add-markdown-parser
pass 2 test
fix bugs item list.
add some tests
re-format code
eliminate Vector class.
change Vector to List and ArrayList
remove "l"
Merge pull request #76 from johtani/eliminate-vector

eliminate Vector class.
Enhance Javadoc descriptions

- added Javadoc to all the public methods
- fixed inconsistent indents
- added a blank line between Javadoc header and @param section
add package-info
re-format for checkstyle-errors
add exception comment
Merge pull request #75 from johtani/add-markdown-parser

Add markdown parser
Merge branch 'master' of github.com:recruit-tech/document-validator into enchance-javadoc-message
add assertions
add paragraph test
add paragraph test
change to down the level to 2nd section in testBasicDocument
 fix bug handling Paragraph in MarkdownParser
Merge pull request #81 from johtani/improve-parser-test

Improve parser test
Merge pull request #77 from takahi-i/enchance-javadoc-message

Enchance javadoc