Add some processing for code lists
Handle verbatim parts
Make tag # hidden from users
Introduce LineStream to support unreading lines back
Rename LineStream#push to #unshift
Unshift line array in flat
Fix bug of missing lines
Update README.md
Explain @<list> in README.md
Add forgotten << for inserting code
Show correct file name under processing
Merge pull request #9 from kazutomi/code_block

code list with auto-numbering