Add the updatesite: mostly copied from the uima one. It needs to be customized a little bit more and better supported by the build system.

Files:
added: /ant/ivy/ivyde/trunk/updatesite/web (try)
added: /ant/ivy/ivyde/trunk/updatesite (try)
added: /ant/ivy/ivyde/trunk/updatesite/site.xml (try)
added: /ant/ivy/ivyde/trunk/updatesite/web/site.xsl (try)
added: /ant/ivy/ivyde/trunk/updatesite/web/site.css (try)
added: /ant/ivy/ivyde/trunk/updatesite/index.html (try)