added a simple "gateway" servlet allowing us to redirect arbitrary URLs

through the Venice logon page

etc/web.xml

@@ -246,6 +246,14 @@
     <servlet-class>com.silverwrist.venice.servlets.CommunityLogo</servlet-class>
   </servlet>
 
+  <servlet>
+    <servlet-name>gateway</servlet-name>
+    <description>
+      Gateways access to a specific URL through the Venice login screen.
+    </description>
+    <servlet-class>com.silverwrist.venice.servlets.Gateway</servlet-class>
+  </servlet>
+
   <!-- the following are test servlets, they should go away -->
 
   <servlet>
@@ -374,6 +382,11 @@
     <url-pattern>/commlogo</url-pattern>
   </servlet-mapping>
 
+  <servlet-mapping>
+    <servlet-name>gateway</servlet-name>
+    <url-pattern>/gw</url-pattern>
+  </servlet-mapping>
+
   <!-- the following are test servlets, they should go away -->
   <servlet-mapping>
     <servlet-name>testformdata</servlet-name>