Using os.path to determine file basename
Ignore subtitle files
Bugfix.

When the video file is not present in the directory
the subtitle was downloaded with the same name provided in input.
This commit redefines 'remove_extension' and fix this.
Merge branch 'dev' of github.com:lucacerone/addic7ed-cli into dev
Added code to handle partial downloads (.part and qBittorrent)