Refactor attachment.js with ES6 features (#2260)
Refactor attachment.js with ES6 features (#2260)


smfreegard/Haraka,msimerson/Haraka,smfreegard/Haraka,haraka/Haraka,haraka/Haraka,msimerson/Haraka,msimerson/Haraka,msimerson/Haraka,smfreegard/Haraka,haraka/Haraka,haraka/Haraka,smfreegard/Haraka