MangaReader.net crawler based on akitaonrails version. There is some features to implement like create the PDF. Feel free to submit a PR!
go get github.com/marcosinger/manga_downloader
Download One Punch Man manga
$ manga_downloader -u "http://www.mangareader.net/onepunch-man"
Changing the default output folder (default: mangareader)
$ manga_downloader -u [manga URL] -o [destination]
Increment parallel process (default: 20)
$ manga_downloader -u [manga URL] -c 40