Use packaged edition of underscore.

src/node/utils/Minify.js

@@ -38,6 +38,7 @@ var tar = JSON.parse(fs.readFileSync(TAR_PATH, 'utf8'));
 
 var LIBRARY_WHITELIST = [
       'security'
+    , 'underscore'
     ];
 
 // Rewrite tar to include modules with no extensions and proper rooted paths.

src/node/utils/tar.json

@@ -59,6 +59,8 @@
   , "jquery.js"
   , "rjquery.js"
   , "underscore.js"
+  , "$underscore.js"
+  , "$underscore/underscore.js"
   , "security.js"
   , "$security.js"
   , "json2.js"