Angular module per each files source

E.g.: (two components in their own ng-module and a default module for the rest)
```js
ngtemplates:
  files: [
    { cwd: 'src/components/',
      src: 'component/*.html', dest: 'build/components/component/component-template.js',
      module: 'component' },
    { cwd: 'src/components/',
      src: 'other-component/*.html', dest: 'build/components/other-component/other-component-template.js',
      module: 'other.component' },
    { cwd: 'src/templates/',
      src: '*.html', dest: 'build/templates/app-templates.js' },
  ]
  options: {
    module: 'app'
  }
```