Add notification medium for web deface

[abhisharma404]

@adeyosemanputra As per discussion, I'm sending the PR connecting web deface with the following notification medium.

1. Twitter
2. Telegram
3. Slack
4. SMS

As discussed earlier, I have used the respective source code, and their original authors have been respectfully mentioned. I have edited it to fit the current environment.

Here's a short summary:

Changes

• Connected web deface with the above notification mediums.
• requirements.txt is added for easy installation

Checklist

• [x] Python 2 & 3 compatible
• [x] Well tested locally
• [x] Documentation & doc-string whenever & wherever required

Steps to start

1. cd web_deface/
2. pip install -r requirements.txt
3. python web_deface.py <notif arguments> For notif arguments, please have a look at notifs/arguments.py

Development Environment

Operating System: Ubuntu 18.04 LTS
Python: 3.6.6 & 2.7

Running For testing only I have stimulated the code a bit to be sensitive to changes.