Default lang options

[bendytree]

This adds two new options: defaultStyleLang and defaultScriptLang. Personally I always use less and typescript, so I wanted a way to set those as the default. Example:

{
  test: /\.vue$/,
  loader: 'vue-loader',
  options: {
    defaultScriptLang: 'ts',
    defaultStyleLang: 'less',
  },
}