jstty / yanpm / 30

90%

master: 90%

Pull #4

travis-ci

(fix) Install modules with post-install scripts

Modules with post-install scripts (e.g. sqlite3, electron) don't output
valid json when using the `--json` flag:

```sh
npm install electron --json 2>/dev/null
```
```
> electron@1.6.2 postinstall /Users/michhart/Desktop/projects/yanpm/node_modules/electron
> node install.js

{
  "name": "yanpm",
  "version": "1.0.0",
  "dependencies": {
    "electron": {
      "version": "1.6.2",
      "from": "electron@latest",
      "resolved": "https://registry.npmjs.org/electron/-/electron-1.6.2.tgz"
    }
  }
}
```

Adding the `--silent` flag will get rid of the postinstall output:

```sh
npm install electron --silent --json 2>/dev/null
```
```
{
  "name": "yanpm",
  "version": "1.0.0",
  "dependencies": {
    "electron": {
      "version": "1.6.2",
      "from": "electron@latest",
      "resolved": "https://registry.npmjs.org/electron/-/electron-1.6.2.tgz"
    }
  }
}
```

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