WTF platformer: UPDATE "WTF platformer"

Game version: 0.3.13 Major updates: Added new track "Circus" Track content: 1.1 New background 1.2 Lower platform 1.3 Swing 1.4 Upper platform 1.5 Spring 1.6 Spiked ring 1.7 Cannon 1.8 Two kinds of punching bags 2.1 Fiv…