added a new serializer - the "empty" serializer, for those widgets who don't
need a serializer (like the TooltipWidget for instance).
<a onclick='__IriSP.MyApiPlayer.share(\'delicious\');' title='partager avec delicious'><span class='share shareDelicious'> </span></a>
<a onclick='__IriSP.MyApiPlayer.share(\'facebook\');' title='partager avec facebook'> <span class='share shareFacebook'> </span></a>
<a onclick='__IriSP.MyApiPlayer.share(\'twitter\');' title='partager avec twitter'> <span class='share shareTwitter'> </span></a>
<a onclick='__IriSP.MyApiPlayer.share(\'myspace\');' title='partager avec Myspace'> <span class='share shareMySpace'> </span></a>