Bundle dependencies of the install script

The install script requires the tar package dependency to be completely
installed before it runs. npm@2 does not guarantee this (see
npm/npm#5001). It can be guaranteed only by
bundling the tar dependency.

Author: sam-github

package.json

@@ -9,6 +9,9 @@
     "nan": "2.x",
     "tar": "2.x"
   },
+  "bundleDependencies": [
+    "tar"
+  ],
   "devDependencies": {
     "node-gyp": "2.x",
     "tap": "^5.7.x"