restructer and move to esdoc

src/Util/ID/ID.js

@@ -0,0 +1,20 @@
+
+export default class ID {
+  constructor (user, clock) {
+    this.user = user // TODO: rename to client
+    this.clock = clock
+  }
+  clone () {
+    return new ID(this.user, this.clock)
+  }
+  equals (id) {
+    return id !== null && id.user === this.user && id.clock === this.clock
+  }
+  lessThan (id) {
+    if (id.constructor === ID) {
+      return this.user < id.user || (this.user === id.user && this.clock < id.clock)
+    } else {
+      return false
+    }
+  }
+}