Avoid error where animation has animationStop$ property of 0, leading to an infinite loop
Set animationPlaying to false if animation has stop time of 0
Merge pull request #359 from virtual-world-framework/branch/avoid-zero-length-animations

Branch/avoid zero length animations
Default the opacity for drawings and images to 1.0 (100%).
Let the app change the opacity based on 100% scale.
Merge pull request #362 from virtual-world-framework/kinetic_drawing_opacity

Default the opacity for drawings and images to 1.0 (100%).
Remove early return from buzz.js' callingMethod function so we can pause sounds
Merge pull request #360 from virtual-world-framework/branch/enable-buzz-callingMethod

Remove early return from buzz.js' callingMethod function so we can pause sounds