Chat updates (#92)

* Send PONG responses to PINGs

* Split out client IDs for viewer counts vs. websocket IDs

* WIP username change event

* Display username changes

* Revert commented out code

* Add support for building from the current branch

* Fix PONG

* Make username changes have a unique ID

* Add a version param to js to cachebust

models/nameChangeEvent.go

@@ -0,0 +1,10 @@
+package models
+
+//NameChangeEvent represents a user changing their name in chat
+type NameChangeEvent struct {
+	OldName string `json:"oldName"`
+	NewName string `json:"newName"`
+	Image   string `json:"image"`
+	Type    string `json:"type"`
+	ID      string `json:"id"`
+}