npm/bundle: remove through depend that wasnt even used

lib/bundle.js

@@ -27,7 +27,6 @@ var mdeps  = require("module-deps"),
     path       = require("path"),
     spawn      = require('child_process').spawn,
     fs         = require("fs"),
-    through    = require("through2"),
     async      = require("async"),
     browserify = require('browserify'),
     builtins   = require("builtins"),

package.json

@@ -32,7 +32,6 @@
     "sprintf": "~0.1.5",
     "step": "0.0.x",
     "tar.gz": "1.0.2",
-    "through": "^2.3.8",
     "yargs": "^3.32.0"
   },
   "nexe": {