'AssetManager.enqueueWithName' now also supports File instances
fixed timing issues when calling 'purgeQueue' and 'loadQueue' in succession (closes #429)
added information about filter disposing (closes #432)
Enable ColorMatrixFilter function chaining

This allows, e.g.:
new ColorMatrixFilter()
    .adjustHue(h)
    .adjustSaturation(s)
    .adjustBrightness(b);
Merge branch 'master' into develop
Merge branch 'chainableColorMatrixFilter' into develop