Scraping scheduler, testing and DB, Cache integration

This is the final PR for the server side.

to test go to server/Fake News copy this folder and perform the following steps:

1. install and activate virtualenv

2. install all required libraries:

   pip install -r requirements.txt

3. also install nltk files, open python terminal:

    1. import nltk
    2. nltk.download('punkt')
    3. nltk.download('wordnet')
    4. nltk.download('stopwords')

4. install postgres for DB and cache

   sudo apt install postgresql postgresql-contrib

5. create a db

   sudo -u postgres createdb fakeNewsDB

   if there is error and required to create user:

    ` sudo -u postgres createuser "usernameOfUrPC"`

6. to install chrome driver for news web scrapping(if not installed already)

   sudo apt-get install chromium-chromedriver

   if there is path error:

   #Adding the path to the selenium line:

   driver = webdriver.Chrome("/usr/lib/chromium-browser/chromedriver")

7. to create all table and handle migration. Do this once

   python API_manager.py db init
   
   python API_manager.py db migrate
   
   python API_manager.py db upgrade
   
   python API_manager.py runserver
   

8. to test if data is committed to DB properly to test if data is committed to DB properly or not

   1. login to DB:

      sudo -u postgres psql

   2. open DB: list all tables present

      \c fakeNewsDB

   3. to open a realtion/table:

      SELECT * FROM "table_name"

Tables after testing:

API request struct for

1. Facebook Request

2. Twitter Request

3. web news Request