Merge pull request #272 from guusdk/master

OF-937: OFMeet plugin should define J2EE web-app version in web.xml files

src/plugins/ofmeet/src/web/WEB-INF/web.xml

+<?xml version="1.0" encoding="UTF-8"?>
+<web-app version="2.4" xmlns="http://java.sun.com/xml/ns/j2ee"
+         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd">
+</web-app>
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