strip all non xml leading content from xml content.  
strip all non xml leading content from xml content.  

git-svn-id: c0b6191cc07a4792c57db861536a2f9523dc26f7@3699 b58a29cf-3064-46da-94c6-1c29cc75c8e5

tanyaLibatter/mwEmbed,joanpuigsanz/mwEmbed,slash851/mwEmbed,omridevk/mwEmbed,matsuu/mwEmbed,panda-os/mwEmbed,DBezemer/mwEmbed,panda-os/mwEmbed,DBezemer/mwEmbed,matsuu/mwEmbed,vladm3/mwEmbed,kaltura/mwEmbed,vladm3/mwEmbed,joanpuigsanz/mwEmbed,slash851/mwEmbed,safarijv/mwEmbed,safarijv/mwEmbed,FlixMaster/mwEmbed,matsuu/mwEmbed,SVSG/mwEmbed,tanyaLibatter/mwEmbed,SVSG/mwEmbed,omridevk/mwEmbed,slash851/mwEmbed,DBezemer/mwEmbed,slash851/mwEmbed,vladm3/mwEmbed,FlixMaster/mwEmbed,bordar/mwEmbed,abaylis/mwEmbed,alexmilk/mwEmbed,bordar/mwEmbed,alexmilk/mwEmbed,tanyaLibatter/mwEmbed,kaltura/mwEmbed,kaltura/mwEmbed,alexmilk/mwEmbed,SVSG/mwEmbed,DBezemer/mwEmbed,bordar/mwEmbed,FlixMaster/mwEmbed,bordar/mwEmbed,abaylis/mwEmbed,SVSG/mwEmbed,abaylis/mwEmbed,omridevk/mwEmbed,joanpuigsanz/mwEmbed,safarijv/mwEmbed,kaltura/mwEmbed,matsuu/mwEmbed,vladm3/mwEmbed,omridevk/mwEmbed,abaylis/mwEmbed,panda-os/mwEmbed,joanpuigsanz/mwEmbed,tanyaLibatter/mwEmbed,panda-os/mwEmbed,safarijv/mwEmbed,alexmilk/mwEmbed,FlixMaster/mwEmbed