(refs #16) Add headers to usage
(refs #16) Add headers to input format from yaml
(refs #16) Change qs IF and refactoring
(refs #16) Add headers to trial request
(refs #16) Add headers to input format from csv
(refs #16) Add headers to input format from apache accesslog
Merge pull request #20 from tadashi-aikawa/#16-add-headers

close #16