Added cookie functionality

[aN0mad]

Problem

I was having a weird problem with LinkedIn where every time I logged out and logged back in I would get a pop-up asking me to confirm my email and phone number. This obliviously created a problem for using this tool, as after successfully authenticating to LinkedIn, I would not be redirected to '/feed' but to the pop-up which causes the script to exit.

Solution

This pull request adds the ability use a Netscape formatted cookie file with the tool, instead of having the tool authenticate with a username/password combo. It also adds a scripts folder with a python script to convert a json python dictionary to the needed Netscape cookie file format.