Remove the DownloadServlet.

The DefaultServlet provided by tomcat handles downloads just fine. We lose
the ability to point back to a different path but we weren't meaningfully
using that ability either.

src/main/webapp/WEB-INF/web.xml

@@ -62,18 +62,4 @@
     <servlet-name>UploadServlet</servlet-name>
     <url-pattern>/upload/*</url-pattern>
   </servlet-mapping>
-  <servlet>
-    <description></description>
-    <display-name>DownloadServlet</display-name>
-    <servlet-name>DownloadServlet</servlet-name>
-    <servlet-class>gov.nysenate.sage.servlets.DownloadServlet</servlet-class>
-  </servlet>
-  <servlet-mapping>
-    <servlet-name>DownloadServlet</servlet-name>
-    <url-pattern>/download</url-pattern>
-  </servlet-mapping>
-  <servlet-mapping>
-    <servlet-name>DownloadServlet</servlet-name>
-    <url-pattern>/download/*</url-pattern>
-  </servlet-mapping>
 </web-app>