This program outputs a plot which displays the sentiment scores of the US states.
The sentiments scores are based on an analysis of the tweets coming from each US state.

In order to download live tweets one has to manually supply some credentials in the file twitterKeys.txt.
To obtain the Twitter credentials do the following:

• Create a twitter account if you do not already have one.
• Go to https://dev.twitter.com/apps and log in with your twitter credentials.
• Click "create an application"
• Fill out the form and agree to the terms. Put in a dummy website if you don't have one you want to use.
• On the next page, scroll down and click "Create my access token"
• Copy your "Consumer key" and your "Consumer secret" into twitterKeys.txt
• Click "Create my access token."
• Copy your "Access token" and your "Access secret" into twitterKeys.txt

After the credentials are se in twitterKeys.txt the program can be run by running the shell get_sentiment.sh (open a terminal and enter "sh get_sentiment.sh").
A sentiment plot of the US states will be shown and saved as "sentiment_plot.png".

TODO:

[-] Not only select tweets based on the 'place' field but also the geolocation in the 'coordinates' field (see https://dev.twitter.com/docs/platform-objects/tweets)