Add Node.JS version to the teaser.

This commit adds the version of node.js to the teaser line.

Previously:

```
Sequelize [CLI: v0.2.6, ORM: v2.0.0-rc1]
```

Afterwards:

```
Sequelize [Node: 0.10.32, CLI: v0.2.6, ORM: v2.0.0-rc1]
```

Fixes #26.
Note: Removing the v from the version string is intended as it
is the new default after #45 got merged.
Merge pull request #46 from sequelize/feature/nodejs-version

Add Node.JS version to the teaser.