Update build.xml

update paths for new build server
Latest Spanish translation by Roberto Gracia.
Merge branch 'master' of https://github.com/VUE/VUE
This fixes #5 by checking for os.name when mrj.version fails
Fix Urls that pointed to vue.uit.tufts.edu

Additionally fixes the link to VUE forums.
Merge remote-tracking branch 'vue-upstream/master'