update authentication system to Devise

app/views/pages/social_home.html.erb

@@ -87,10 +87,10 @@
       <img src='<%= "#{@api_domain}images/social_sensor_network_main.png "%>' width='600' height='415' border='0' />
     <% end %>
     <h2>the social sensor network is forming.</h2>
-    <h3>We have one thing in common. At almost all times we are connected to the web.<br />
+    <h3>We have one thing in common. At almost all times we are connected to the web.<br>
       The Social Sensor Network allows everyone to report and share data in an open and meaningful way.</h3>
       
-      <br />
+      <br>
 
     <form method=post action="https://app.icontact.com/icp/signup.php" name="icpsignup" id="icpsignup2312" accept-charset="UTF-8" onsubmit="return verifyRequired2312();" >
       <input type=hidden name=redirect value="http://www.socialsensornetwork.com?invite=success" />
@@ -128,12 +128,12 @@
       }
     </script>
     
-      <br />
-      <br />
+      <br>
+      <br>
       
     <span id="demo_text">demo channels</span>
     
-      <br />      
+      <br>      
   
     <span id="demo"><a href="http://www.socialsensornetwork.com/irs-refund">IRS Refunds</a></span>
     <span id="demo"><a href="http://www.socialsensornetwork.com/online-poker">Frozen Online Poker Money</a></span>