Is this the best way to add spacing to text content?

[zepumph]

In the ReadoutPanel used by the WireBox, we have this constant:
var SPACING = new Text( '-', { font: FONT } ).width;

It seems like there is a better way to do this. Here is an example usage:

    var equalsSign = new Text( '=', {
      font: FONT,
      fill: 'black',
      left: textContainer.width + SPACING
    } );

[zepumph]

from code review: #51, closing