Updated #get_tweets to reassign the query url each time through its loop. Previously, although a since_id was being assigned, the url being used in the query was not incorporating that updated value.  This bug fix ensures that all tweets retrieved are unique.  We receive fewer tweets as a result, but now have data that accurately represents activity on Twitter.  Also refactored the TwitterRequest initializer to require fewer arguments.
Made style revisions based on Rubocop linter.
Formatted coordinates into an array of arrays for ease of use with the Google Maps api.
Replaced hard-coded query with a parameter to get_tweets.
Removed unused methoed from tweets.rb, loaded tweets.rb into server.rb via require_relative.
Pulled down master, resolved conflicts.
Refactored server.rb by extracting procedural code into methods in tweets.rb.