Feature: View conversation labels on sidebar (#436)

app/javascript/dashboard/api/conversations.js

@@ -0,0 +1,18 @@
+/* global axios */
+import ApiClient from './ApiClient';
+
+class ConversationApi extends ApiClient {
+  constructor() {
+    super('conversations');
+  }
+
+  getLabels(conversationID) {
+    return axios.get(`${this.url}/${conversationID}/labels`);
+  }
+
+  createLabels(conversationID) {
+    return axios.get(`${this.url}/${conversationID}/labels`);
+  }
+}
+
+export default new ConversationApi();