Add all_following endpoint.

src/services/api/api.service.js

 /* eslint-env browser */
 const LOGIN_URL = '/api/account/verify_credentials.json'
 const FRIENDS_TIMELINE_URL = '/api/statuses/friends_timeline.json'
+const ALL_FOLLOWING_URL = '/api/qvitter/allfollowing'
 const PUBLIC_TIMELINE_URL = '/api/statuses/public_timeline.json'
 const PUBLIC_AND_EXTERNAL_TIMELINE_URL = '/api/statuses/public_and_external_timeline.json'
 const FAVORITE_URL = '/api/favorites/create'
@@ -54,6 +55,12 @@ const fetchFriends = ({credentials}) => {
     .then((data) => data.json())
 }
 
+const fetchAllFollowing = ({username, credentials}) => {
+  const url = `${ALL_FOLLOWING_URL}/${username}.json`
+  return fetch(url, { headers: authHeaders(credentials) })
+    .then((data) => data.json().users)
+}
+
 const fetchMentions = ({username, sinceId = 0, credentials}) => {
   let url = `${MENTIONS_URL}?since_id=${sinceId}&screen_name=${username}`
   return fetch(url, { headers: authHeaders(credentials) })
@@ -169,7 +176,8 @@ const apiService = {
   retweet,
   postStatus,
   deleteStatus,
-  uploadMedia
+  uploadMedia,
+  fetchAllFollowing
 }
 
 export default apiService

src/services/backend_interactor_service/backend_interactor_service.js

@@ -17,6 +17,10 @@ const backendInteractorService = (credentials) => {
     return apiService.fetchFriends({credentials})
   }
 
+  const fetchAllFollowing = ({username}) => {
+    return apiService.fetchAllFollowing({username, credentials})
+  }
+
   const followUser = (id) => {
     return apiService.followUser({credentials, id})
   }
@@ -32,6 +36,7 @@ const backendInteractorService = (credentials) => {
     fetchFriends,
     followUser,
     unfollowUser,
+    fetchAllFollowing,
     verifyCredentials: apiService.verifyCredentials
   }