Addition:
* about exit status in manpage
Amendment:
* Japanese man file (保存 -> 保持)
Alteration:
* exit code -> exit status
Addition:
* status 255 in manpage
Amendment:
* installation settings only in Unix mode
Addition:
* ignore callgrind analysis data
Amendment:
* manpage
Addition:
* bash completion
Alteration:
* no space when parameter needs value in bash completion
Addition:
* "--version" option
Refactoring:
* exit status with "--version" option
Amendment:
* check whether URL is specified or not
Addition:
* image format completion ("--format" option)