Fixes #14 only display follow button if user is logged in

src/components/user_card_content/user_card_content.vue

@@ -6,7 +6,7 @@
         <span class="glyphicon glyphicon-user"></span>
         <div class='user-name'>{{user.name}}</div>
         <div class='user-screen-name'>@{{user.screen_name}}</div>
-        <div v-if="isOtherUser" class="following-info">
+        <div v-if="isOtherUser && loggedIn" class="following-info">
           <div v-if="user.follows_you" class="following">
             Follows you!
           </div>
@@ -58,6 +58,9 @@
       },
       isOtherUser () {
         return this.user !== this.$store.state.users.currentUser
+      },
+      loggedIn () {
+        return !!this.$store.state.users.currentUser
       }
     },
     methods: {