PortalLayout demo check if the appended node is already on the doc before replace with the new portlet
PortalLayout demo check if the appended node is already on the doc before replace with the new portlet

git-svn-id: eaac6977d0b6fa3343c402860739874625caf655@45440 05bdf26c-840f-0410-9ced-eb539d925f36

Khamull/alloy-ui,mairatma/alloy-ui,ampratt/alloy-ui,zsagia/alloy-ui,seedtigo/alloy-ui,antoniopol06/alloy-ui,Preston-Crary/alloy-ui,crimago/alloy-ui,ipeychev/alloy-ui,zsigmondrab/alloy-ui,ericyanLr/alloy-ui,zsigmondrab/alloy-ui,dsanz/alloy-ui,ampratt/alloy-ui,peterborkuti/alloy-ui,pei-jung/alloy-ui,antoniopol06/alloy-ui,mthadley/alloy-ui,modulexcite/alloy-ui,samanzanedo/alloy-ui,zsagia/alloy-ui,dsanz/alloy-ui,peterborkuti/alloy-ui,thiago-rocha/alloy-ui,seedtigo/alloy-ui,drewbrokke/alloy-ui,inacionery/alloy-ui,zxdgoal/alloy-ui,Khamull/alloy-ui,BryanEngler/alloy-ui,fernandosouza/alloy-ui,4talesa/alloy-ui,Preston-Crary/alloy-ui,eduardolundgren/alloy-ui,fernandosouza/alloy-ui,mthadley/alloy-ui,thiago-rocha/alloy-ui,drewbrokke/alloy-ui,henvic/alloy-ui,crimago/alloy-ui,ericchin/alloy-ui,zxdgoal/alloy-ui,ambrinchaudhary/alloy-ui,dsanz/alloy-ui,inacionery/alloy-ui,ipeychev/alloy-ui,dsanz/alloy-ui,bryceosterhaus/alloy-ui,pei-jung/alloy-ui,zenorocha/alloy-ui,jonathanmccann/alloy-ui,henvic/alloy-ui,ericchin/alloy-ui,zenorocha/alloy-ui,ambrinchaudhary/alloy-ui,brianchandotcom/alloy-ui,modulexcite/alloy-ui,westonhancock/alloy-ui,mairatma/alloy-ui,BryanEngler/alloy-ui,bryceosterhaus/alloy-ui,westonhancock/alloy-ui,jonathanmccann/alloy-ui,ericyanLr/alloy-ui,4talesa/alloy-ui