Sentiment ml model web scrapper integration

[hzco]

Made a small change to web_scrapper to fix the labels for the csv file it creates.

Most of the changes were made to models.py for the ml models.

we still need to figure out a way to not scrap the web every time the endpoint is called. I will raise an issue for this on github.

[hzco]

Also updated the time-series endpoint with the multi day forecasting model