add moment

ts/index.ts

@@ -3,3 +3,5 @@ import * as plugins from './smarttime.plugins'
 export * from './smarttime.classes.hrtmeasurement'
 export * from './smarttime.classes.timestamp'
 export * from './smarttime.units'
+
+export { moment } from './smarttime.plugins'

ts/smarttime.plugins.ts

@@ -1 +1,7 @@
 import 'typings-global'
+
+import * as moment from 'moment'
+
+export {
+  moment
+}