code: function preparePartials(options) {
    return Promise.all([
      registerPartials(options.src.templates, options), // Partials as partials
      registerPartials(options.src.patterns, options, 'patterns') // Patterns
    ]).then(() => options, error => DrizzleError.error(error, options.debug));
  }
docs: Register a glob of partials.
  @param {Object} Handlebars instance
  @param {String|Array} glob