added whole system from ola4doc

sys/node_modules/tar/examples/extracter.js

@@ -0,0 +1,19 @@
+var tar = require("../tar.js")
+  , fs = require("fs")
+
+
+function onError(err) {
+  console.error('An error occurred:', err)
+}
+
+function onEnd() {
+  console.log('Extracted!')
+}
+
+var extractor = tar.Extract({path: __dirname + "/extract"})
+  .on('error', onError)
+  .on('end', onEnd);
+
+fs.createReadStream(__dirname + "/../test/fixtures/c.tar")
+  .on('error', onError)
+  .pipe(extractor);