Updated README formatting
fix blending field to take user-defined parameter
corrected opacityMiddle calculation
Merge pull request #4 from stemkoski/patch-1

fix blending field to take user-defined parameter
Fixed issue re. vertex shader positionInTime and halfDuration definitions - Windows appears to not calculate these when outside of main
Merge branch 'master' into gh-pages

# By stemkoski (2) and others
* master:
  Fixed issue re. vertex shader positionInTime and halfDuration definitions - Windows appears to not calculate these when outside of main
  corrected opacityMiddle calculation
  fix blending field to take user-defined parameter
  Updated README formatting