download through wget(faster) instead of native one.

I'm still a little skeptical on this pull request. It is obviously questionable in wraper point of view but it makes the command line client a lot faster to download things and also to manage Connection break during large files like videos (for slow connections like mine). So i'm making this request.

I am just a beginner who wants to contribute, I'm really sorry if this is bad request.

( Inspired from coursera-dl wget option )