Converted monochromebars.png to indexed color because Safari doesn't like grayscale images
http://stackoverflow.com/questions/21540074/webgl-2d-texture-display-error
Regression fix: changes to GL blend function broke anything with alpha < 1.0
- need to reset blend function to correct default values
- `dstAlpha` and `dstRGB` were misspelled in blend effect
- layers effect needs to specify blend function components