Added all dm* gems to .gems manifest

.gems

@@ -1 +1,6 @@
 sbfaulkner-sinatra-helpers -s http://gems.github.com
+dm-core
+dm-validations
+dm-timestamps
+dm-aggregates
+dm-serializer

views/scoreboard.haml

@@ -78,11 +78,11 @@
           CAPTCHA 
         to prevent automated downloads.
     %tr
-      %td.strong Start date
+      %td.strong Start
       %td
         The start of the period for which spending data is published.  
     %tr
-      %td.strong End date
+      %td.strong End
       %td
         The end of the period for which spending data is published.  
     %tr