Parse CLI Options

Now you can pass in the file and Twitter creds in the CLI options:

flyaway -f path/to/tweets.csv \ # specify the location of the tweets file
--ck=[consumer_key] \ # specify the Twitter consumer key for the app
--cs=[consumer_secret] \ # specify the Twitter consumer secret for the app
--atk=[access_token_key] \ # specify the Twitter access token key for the user
--ats=[access_token_secret] # specify the Twitter access token secret for the user