Fixes #27 incorrect call to to_s causes execution error.

app/models/dmsf_file.rb

@@ -114,6 +114,8 @@ class DmsfFile < ActiveRecord::Base
       self.revisions.visible.each {|r| r.delete(true)}
       self.destroy
     else
+      #Revisions of a deleted file SHOULD be deleted too
+      self.revisions.visible.each {|r| r.delete }
       self.deleted = true
       self.deleted_by_user = User.current
       save

app/views/dmsf_files/_revision_access.html.erb

@@ -13,8 +13,8 @@
 			<tr>
 				<td><%=link_to_user(access.user)%></td>
 				<td><%=access["count"]%></td>
-				<td><%=access.min.to_s(:db)%></td>
-				<td><%=access.max.to_s(:db)%></td>
+				<td><%=access.min.to_s%></td>
+				<td><%=access.max.to_s%></td>
 			</tr>
 <% end %>
 		</tbody>