Fix #13, socks proxy and added check for tor exit node

[A73X]

I encountered an issue with missing dependencies for the proper proxying of tor traffic with requests. I updated requirements.txt using pip freeze.

I noticed that the check for the tor exit node wasn't properly implemented. I refactored it using check.torproject.org's api.

Finally, I also had the dead onion issue. In my case, it was linked to nltk. I added some nltk.download.

This PR is not perfect, it is a quick fix but it's working. Didn't do much testing ;)