Implements performance.now (based on process.hrtime).
HTTP proxy tunneling agent. Formerly part of mikeal/request, now a standalone module.
AWS signing. Originally pulled from LearnBoost/knox, maintained as vendor in request, now a standalone module.
HTTP Agent that keeps socket connections alive between keep-alive requests. Formerly part of mikeal/request, now a standalone module.
OAuth 1 signing. Formerly a vendor lib in mikeal/request, now a standalone module.