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;
	  }
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}
/ * Set the breadcrumbCallback option