Merge pull request #30 from progressify/master

docker integration

fixed error when downloading files with / in filename (#13)

fixed error when downloading files with / in filename

Merge pull request #6 from Keek/patch-1

remove colons from book_name

Merge pull request #3 from BurnhamG/update

Fix typo

Add missing variable assignment.

Merge pull request #2 from BurnhamG/update

Document new command-line options

Add options for verbose, quiet, and separate directories.

Add separate directory option and checking for existing files

checking status code

Update README.md