Makes the command name be steal-tools

```js
steal-tools build
```

```js
steal-tools pluginify
```

Addresses problem discussed in #45
bin/steal should user pluginifier

stealTools.pluginify was renamed to stealTools.pluginifier so this
updates the command-line script to use that.
Merge pull request #46 from matthewp/command-name

Makes the command name be steal-tools