[FEAT] (protovis Bullet layout) Added a mark-wide property "originIsZero" to allow preventing that zero is always part of the scale. Also added the "minimum" mark property, to pair with the existing "maximum" mark property.
[FIX](protovis JsDocs GoogleCompiler) Made google compiler happier with the used type annotations.
[FIX](extension points) Do not intercept protovis pseudo-properties (those not in the Mark#properties hash).