refactor 'cycle_analytics' to use axios

app/assets/javascripts/cycle_analytics/cycle_analytics_bundle.js

@@ -82,7 +82,6 @@ export default () => {
 
         this.service
           .fetchCycleAnalyticsData(fetchOptions)
-          .then(resp => resp.json())
           .then((response) => {
             this.store.setCycleAnalyticsData(response);
             this.selectDefaultStage();
@@ -116,7 +115,6 @@ export default () => {
             stage,
             startDate: this.startDate,
           })
-          .then(resp => resp.json())
           .then((response) => {
             this.isEmptyStage = !response.events.length;
             this.store.setStageEvents(response.events, stage);

app/assets/javascripts/cycle_analytics/cycle_analytics_service.js

-import Vue from 'vue';
-import VueResource from 'vue-resource';
-
-Vue.use(VueResource);
+import axios from '~/lib/utils/axios_utils';
 
 export default class CycleAnalyticsService {
   constructor(options) {
-    this.requestPath = options.requestPath;
-    this.cycleAnalytics = Vue.resource(this.requestPath);
+    this.axios = axios.create({
+      baseURL: options.requestPath,
+    });
   }
 
   fetchCycleAnalyticsData(options = { startDate: 30 }) {
-    return this.cycleAnalytics.get({ cycle_analytics: { start_date: options.startDate } });
+    return this.axios
+      .get('', {
+        params: {
+          'cycle_analytics[start_date]': options.startDate,
+        },
+      })
+      .then(x => x.data);
   }
 
   fetchStageData(options) {
@@ -19,12 +23,12 @@ export default class CycleAnalyticsService {
       startDate,
     } = options;
 
-    return Vue.http.get(`${this.requestPath}/events/${stage.name}.json`, {
-      params: {
-        cycle_analytics: {
-          start_date: startDate,
+    return this.axios
+      .get(`events/${stage.name}.json`, {
+        params: {
+          'cycle_analytics[start_date]': startDate,
         },
-      },
-    });
+      })
+      .then(x => x.data);
   }
 }