add options param to jade compiler

I want to pass an 'options' param to jade compiler.

### default
```
templatizer(__dirname + '/src/jade-templates', __dirname + '/src/js/_templates.js');
```

### add my options
```
templatizer(__dirname + '/src/jade-templates', __dirname + '/src/js/_templates.js', null, { doctype: '5' });
```