Decouple chat from core and add chat rest api (#25)

* Decouple the chat package from the core

* Add rest api endpoints for the chat aspect

controllers/controllers.go

@@ -0,0 +1,26 @@
+package controllers
+
+import (
+	"encoding/json"
+	"net/http"
+)
+
+type j map[string]interface{}
+
+func internalErrorHandler(w http.ResponseWriter, err error) {
+	if err == nil {
+		return
+	}
+
+	w.WriteHeader(http.StatusInternalServerError)
+	json.NewEncoder(w).Encode(j{"error": err.Error()})
+}
+
+func badRequestHandler(w http.ResponseWriter, err error) {
+	if err == nil {
+		return
+	}
+
+	w.WriteHeader(http.StatusBadRequest)
+	json.NewEncoder(w).Encode(j{"error": err.Error()})
+}