Add an option for verbose output (similar to component build -v)

Example:

```
        component_build: {
            app: {
                base: 'client/',
                output: 'client/build/',
                styles: true,
                scripts: true,
                sourceUrls: true,
                verbose: true
            }
```

Will produce output like:

```
Running "component_build:app" (component_build) task
duration: 57ms
write: client/build/app.css (12kb)
write: client/build/app.js (214kb)
```

Added because I like to be able to keep an eye on the size of my app as I integrate components.