add node modules to repo

node_modules/mksnapshot/README.md

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+# mksnapshot
+
+Generates snapshot file for [Electron][Electron].
+
+## Installing
+
+```sh
+npm install mksnapshot
+```
+
+## Docs
+
+```javascript
+var mksnapshot = require('mksnapshot');
+```
+
+### mksnapshot(content, target, version, arch, builddir, callback)
+
+Generates snapshot file for `content` and copies it to `target`, `callback` will
+be called with `error` when failed, and with `null` when succeeded.
+
+You also need to specify [Electron][Electron]'s `version` and `arch`, as well as
+the `builddir` where temporary files and downloaded binaries will be put.
+
+[Electron]: https://github.com/atom/electron