Add options to omit and skip templates

[cossssmin]

This PR adds two new options to build.templates: omit and skip.

omit

This can be used to define paths to files or directories from your source that should not be copied over to the build destination.

For example, imagine your project's src/templates contained these files:

src/templates
├── 1.html
├── 2.html
└── archive
    ├── 3.html
    └── 4.html

You can prevent 1.html and 4.html from being copied to the build destination like this:

module.exports = {
  build: {
    templates: {
      source: 'src/templates',
      omit: ['1.html', 'archive/4.html'],
      // ...
    }
  }
}

In this case, running maizzle build production would create a build_production folder with these files inside:

build_production
├── 2.html
└── archive
    ├── 3.html

It supports directory paths, so you can omit the entire archive folder:

module.exports = {
  build: {
    templates: {
      source: 'src/templates',
      omit: ['1.html', 'archive'],
      // ...
    }
  }
}

The result would be:

build_production
├── 2.html

skip

Use the new skip option if you want to skip the compilation of a template. The file will only be copied as-is to the build destination, it will not be parsed in any way by Maizzle.

module.exports = {
  build: {
    templates: {
      source: 'src/templates',
      skip: ['1.html', 'archive/3.html'],
      // ...
    }
  }
}

skip can be a string (excludes just one template) or an array of strings like in the example above.

Each string must be a file path that is relative to your templates.source directory.