Use first name instead of full

Author: garyhtou

app/views/hackathon/subscriptions/index.html.erb

@@ -7,7 +7,7 @@
 <% else %>
 
   <p>
-    Hey there, <b><%= @user.name || @user.email_address %></b>!
+    Hey there, <b><%= @user.first_name || @user.email_address %></b>!
     <br/>
     You are currently subscribed to the following locations.
   </p>