Made method catch remote exception
Made method throw remote exception
now deals with remote ex
Corrected user choice loop
Changed structure of loop to only exit upon user request
Now returns null if it can't get the quiz 
To be handled in the player client.
added comment re handling the null return value
SeeActiveQuizzes method to be handled in the launcher class
This is because the method requires no user input.
Added launch method
Added main method and start of launch method
Implemented exit of player client
Added method to get user quiz id choice
Added code to handle incorrectly entered quiz ID
Added code to get player responses to a quiz
Answers are loaded into a newly created Attempt obj which will be sent
to the server.
Added code to generate an attempt, submit it, and get the score.
Added code to nicely format player's score before printing