Update ringojs installer

toolset/setup/linux/languages/ringojs.sh

@@ -1,10 +1,12 @@
 #!/bin/bash
 
-RETCODE=$(fw_exists /usr/share/ringojs)
+RETCODE=$(fw_exists ringo.installed)
 [ ! "$RETCODE" == 0 ] || { return 0; }
 
 fw_get http://www.ringojs.org/downloads/ringojs_0.10-1_all.deb
 sudo apt-get install -y jsvc
 sudo dpkg -i ringojs_0.10-1_all.deb
 
-rm ringojs_0.10-1_all.deb
+rm -f ringojs_0.10-1_all.deb
+
+touch $IROOT/ringo.installed