Make computer class read more clearly

*Change answer class to computer class
*Add method to generate computer answer
Move computer generated response to occur later

*Make computer guess after human guesses
Initialize game with instance of computer opponent

*Change computer class to have access to Answers constant
Change computer move behavior to create random number
Working loop

*Include winning combos as a hash
Add results hash to compare results method
Fix syntax error in hash, print computer move
Add downcase to user input
Create constants for valid user inputs
*Refactor for better reading

*Removed extra line space in computer rb
*changed method definition to "exit on user request"
Remove instance variable from def move in computer class
Remove magic number from computer move function
Refactor to count rounds

*Count rounds
*Display current round
Fix indentation on answer_options hash
Change computer move function to return cactual answer option, not integer
Fix computer move to randomly select from array

*Remove unnecessary line spaces
Remove parantheses from constant
Make all methods after play private