+ Fixed "wicket" filter that will be appended to web.xml of the app that installs the grails-wicket plugin
Problem shows up only when deployed to JBoss app server.

DETAILS:
           TIP: If you want to change the URL pattern from  "/app/*" you need to change in 2 places below.
           Once in "filterMappingUrlPattern"
           And also in the filter-mapping for "wicket" filter

           Helpful resources:
           1. 'param-name'('applicationClassName')
                See web.xml section. http://wicket.apache.org/learn/examples/helloworld.html
                Note: WicketApplication class refers to file in Configuration inside the app where this plugin is installed not the one in this plugin itself.
           2. 'param-name'('applicationFactoryClassName')
                For tip on adding SpringWebApplicationFactory if using @SpringBean
                https://cwiki.apache.org/confluence/display/WICKET/SpringBean+outside+Wicket
                P.S: info from official api docs was confusing & did not work : http://wicket.apache.org/apidocs/1.5/org/apache/wicket/spring/SpringWebApplicationFactory.html
           3.  'param-name'('filterMappingUrlPattern')
                Helped crack the below error : http://stackoverflow.com/questions/5494395/how-to-use-guice-servlet-with-wicket
                     java.lang.IllegalStateException: filter path was not configured
	                    at org.apache.wicket.protocol.http.WicketFilter.processRequest(WicketFilter.java:141)