pre-load blink play sound action

refactor score label to its own class, add unit tests for Switch and ScoreLabel classes

move Ball to its own class, refactor collision method

refactor colorSwitch component to a separate class

add ReadMe

update world gravity on each successful switch, add game over sound, add app logo

add menu label animation and sound on score increase

save high and recent scores and display on the menu scene

add menu scene

addd score mechanics

implement main game logic - switch correct and game over condition

implement SKPhysicsContactDelegate protocol to detect collision

add initial physics for ball and switch

add initial sprites and place them on the screen

Merge branch 'master' of github.com:paxer/ColorSwitch