demo/dist/demo.js
function setBreadcrumbCallback(callback) {
	    var original = this._globalOptions.breadcrumbCallback;
	    this._globalOptions.breadcrumbCallback = keepOriginalCallback(original, callback);
	    return this;
	  }
function setBreadcrumbCallback(callback) {
	    var original = this._globalOptions.breadcrumbCallback;
	    this._globalOptions.breadcrumbCallback = keepOriginalCallback(original, callback);
	    return this;
	  }
/*
Set the breadcrumbCallback option

@param {function} callback The callback to run which allows filtering
or mutating breadcrumbs
@return {Raven}