function createDimensionModel(dimensionInd, containerInd, displayInd, dimensionLabel, count) {
    return {
        dimensionInd: dimensionInd,
        containerInd: containerInd,
        displayInd: displayInd,
        dimensionLabel: dimensionLabel,
        count: count,
        categories: [],
        dragX: null
    };
}
Create and new DimensionModel object with an empty categories array
@param {Number} dimensionInd
@param {Number} containerInd
@param {Number} displayInd
@param {String} dimensionLabel
@param {Number} count
 Total number of input values
@return {DimensionModel}