Wrapper for chart.js
Allows configuring chart js using the provider

angular.module('myModule', ['chart.js']).config(function(ChartJsProvider) {
ChartJsProvider.setOptions({ responsive: true });
ChartJsProvider.setOptions('Line', { responsive: false });
})))
function ChartJsProvider () {
    var options = {};
    var ChartJs = {
      Chart: Chart,
      getOptions: function (type) {
        var typeOptions = type && options[type] || {};
        return angular.extend({}, options, typeOptions);
      }
    };

    /**
     * Allow to set global options during configuration
     */
    this.setOptions = function (type, customOptions) {
      // If no type was specified set option for the global object
      if (! customOptions) {
        customOptions = type;
        options = angular.extend(options, customOptions);
        return;
      }
      // Set options for the specific chart
      options[type] = angular.extend(options[type] || {}, customOptions);
    };

    this.$get = function () {
      return ChartJs;
    };
  }