Add following and follower post type documentation

Gemfile.lock

@@ -1,6 +1,6 @@
 GIT
   remote: git://github.com/tent/tent-schemas.git
-  revision: 2e382e3b9a29a045a1c40ba3e94bd931a3fe93ba
+  revision: e86241f750efbc805c3b76873e063b07e225914e
   branch: master
   specs:
     tent-schemas (0.0.1)

content/docs/post-types.md

@@ -126,6 +126,23 @@ profile.
 {post_delete schema}
 
 
+#### Following
+
+`https://tent.io/types/post/following/v0.1.0`
+
+**Following** tracks creation and deletion of followings.
+
+{post_following schema}
+
+
+#### Follower
+
+`https://tent.io/types/post/follower/v0.1.0`
+
+**Follower** tracks creation and deletion of followers.
+
+{post_follower schema}
+
 
 ### Creating New Post Types