* Add comics-downloader parser
The utility comics-downloader can be used to download comics
and produces files of the type "seriesname-chapternumberpadded".
This adds support for that format.
For more info https://github.com/Girbons/comics-downloader
* Adjusted the test cases and added .+? to consume less characters.
Co-authored-by: Joseph Milazzo <joseph.v.milazzo@gmail.com>