Restful refactor of accounts/ routes (#2133)

* Add routing specs for accounts followers and following actions

* Use more restful route naming for public account follow pages

Moves two actions:
- accounts#followers to accounts/follower_accounts#index
- accounts#following to accounts/following_accounts#index

Adds routing spec to ensure prior URLs are preserved.

spec/routing/accounts_routing_spec.rb

@@ -0,0 +1,31 @@
+require 'rails_helper'
+
+describe 'Routes under accounts/' do
+  describe 'the route for accounts who are followers of an account' do
+    it 'routes to the followers action with the right username' do
+      expect(get('/users/name/followers')).
+        to route_to('follower_accounts#index', account_username: 'name')
+    end
+  end
+
+  describe 'the route for accounts who are followed by an account' do
+    it 'routes to the following action with the right username' do
+      expect(get('/users/name/following')).
+        to route_to('following_accounts#index', account_username: 'name')
+    end
+  end
+
+  describe 'the route for following an account' do
+    it 'routes to the follow create action with the right username' do
+      expect(post('/users/name/follow')).
+        to route_to('account_follow#create', account_username: 'name')
+    end
+  end
+
+  describe 'the route for unfollowing an account' do
+    it 'routes to the unfollow create action with the right username' do
+      expect(post('/users/name/unfollow')).
+        to route_to('account_unfollow#create', account_username: 'name')
+    end
+  end
+end