Version 0.7

# Version 0.7
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#    - Removed threading for event handler due to conflicts with pygame
#    - Added poll components method for slot machine to sync component
events with main loop
#    - Added shutdown method for slotmachine
#    - Made Reset and Exit button actually work
#    - bet amount and credits now render
#    - Bet amount ranges between 1, 2, 5, 10, 25, 50, 100
#    - Greyed out spin button if bet amount exceeds credit amount
#    - Started implementing reels
#    - Added slot_machine_brain module for easy referencing. Might not
use exact code.
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