Add epub subcommand skelton
Add epub subcommand to use bitclust command
Add a mimetype file
Add a EPUB container file
Add EPUB generator skelton
Implement generation of static files
Add --filename option to specify generated EPUB filename
Add --keep option for debug
Add missing new line
Fix square bracket position
Remove unnecessary path separators
Use mkdir_p instead of mkdir
Make temporary directory for working files
Implement generation of CSS and favicon
Implement generation of images
Use cp instead of copy
Implement generation of html files
Implement generation of a empty navigation
Use rm_r instead of remove_entry_secure
Separate variable name with underscore