New servlet structure with a dedicated class UmlDiagramService to

produce diagram from a compressed source.

content/WEB-INF/web.xml

@@ -9,6 +9,14 @@
         <servlet-name>welcome</servlet-name>
         <servlet-class>net.sourceforge.plantuml.servlet.Welcome</servlet-class>
     </servlet>
+    <servlet>
+        <servlet-name>imgservlet</servlet-name>
+        <servlet-class>net.sourceforge.plantuml.servlet.ImgServlet</servlet-class>
+    </servlet>
+    <servlet>
+        <servlet-name>svgservlet</servlet-name>
+        <servlet-class>net.sourceforge.plantuml.servlet.SvgServlet</servlet-class>
+    </servlet>
     <!-- Patterns of the servlet -->
     <servlet-mapping>
         <servlet-name>welcome</servlet-name>
@@ -23,9 +31,13 @@
         <url-pattern>/form</url-pattern>
     </servlet-mapping>
     <servlet-mapping>
-        <servlet-name>plantumlservlet</servlet-name>
+        <servlet-name>imgservlet</servlet-name>
         <url-pattern>/img/*</url-pattern>
     </servlet-mapping>
+    <servlet-mapping>
+        <servlet-name>svgservlet</servlet-name>
+        <url-pattern>/svg/*</url-pattern>
+    </servlet-mapping>
     <servlet-mapping>
         <servlet-name>plantumlservlet</servlet-name>
         <url-pattern>/start/*</url-pattern>