Migrate Vaadin7SpringSecurityBaseAuthentication

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diff --git a/documentation/articles/Vaadin7SpringSecurityBaseAuthentification.asciidoc b/documentation/articles/Vaadin7SpringSecurityBaseAuthentification.asciidoc
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+++ b/documentation/articles/Vaadin7SpringSecurityBaseAuthentification.asciidoc
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+[[vaadin-7-spring-security-base-authentication]]
+Vaadin 7 + Spring Security (base authentication)
+------------------------------------------------
+
+Vaadin 7 is easy to integrate with Spring Security. You should configure only
+2 files. First - web.xml and second one spring-security.xml (user
+credentials and security settings). This is a small example on how to use
+base form for authentification.
+
+[[web.xml-configuration]]
+web.xml Configuration
+^^^^^^^^^^^^^^^^^^^^^
+
+[source,xml]
+....
+<?xml version="1.0" encoding="UTF-8"?>
+<web-app xmlns:xsi="[[http://www.w3.org/2001/XMLSchema-instance"xmlns="http://java.sun.com/xml/ns/javaee"xsi:schemaLocation="http://java.sun.com/xml/ns/javaeehttp://java.sun.com/xml/ns/javaee/web-app_3_0.xsd"id="WebApp_ID|http://www.w3.org/2001/XMLSchema-instance"xmlns="http://java.sun.com/xml/ns/javaee"xsi:schemaLocation="http://java.sun.com/xml/ns/javaeehttp://java.sun.com/xml/ns/javaee/web-app_3_0.xsd"id="WebApp_ID]]" version="3.0">
+  <display-name>Vaadin7SpringSecurity</display-name>
+  <context-param> <param-name>contextConfigLocation</param-name> <param-value> /WEB-INF/spring/spring-security.xml </param-value></context-param>
+  <listener> <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class></listener>
+  <!-- filter declaration for Spring Security -->
+  <filter>
+    <filter-name>springSecurityFilterChain</filter-name>
+    <filter-class>org.springframework.web.filter.DelegatingFilterProxy</filter-class>
+  </filter>
+  <filter-mapping>
+    <filter-name>springSecurityFilterChain</filter-name>
+    <url-pattern>/*</url-pattern>
+  </filter-mapping>
+</web-app>
+....
+
+[[spring-security.xml]]
+spring-security.xml
+^^^^^^^^^^^^^^^^^^^
+
+[source,xml]
+....
+<beans:beans xmlns="http://www.springframework.org/schema/security"
+xmlns:beans="http://www.springframework.org/schema/beans"
+xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+xsi:schemaLocation="http://www.springframework.org/schema/beans
+      http://www.springframework.org/schema/beans/spring-beans-3.2.xsd
+      http://www.springframework.org/schema/security
+      http://www.springframework.org/schema/security/spring-security-3.1.xsd">
+
+<http auto-config='true'>
+  <intercept-url pattern="/*" access="ROLE_USER" />
+</http>
+
+<authentication-manager>
+  <authentication-provider>
+    <user-service>
+      <user name="user" password="password" authorities="ROLE_USER" />
+    </user-service>
+  </authentication-provider>
+</authentication-manager>
+
+</beans:beans>
+....
+
+For more details, how to extend *spring-security.xml* configuration you
+can use
+http://docs.spring.io/autorepo/docs/spring-security/3.0.x/reference/ns-config.html[Spring
+resources].