There are few improvements/ refinements to make to luis:build

1. Today, by default the write all generated files to the cwd() or the --out folder (if specified). We should change this behavior such that, in cases where no --out folder is specified,
   • any .dialog file generated should go to the respective folder where the .lu file was found. As an example, if the user ran bf luis:build --in /myBot and we found these two .lu files - ./dialog1/dialog1.lu and ./dialog2/dialog2.lu then all *.lu.dialog for dialog1.lu should go under ./dialog and those for dialog2.lu should go under ./dialog2.
   • NOTE: this is the default behavior when no --out folder is specified
2. luis:build write out a lot to console. we should move all these messages to be rendered only when --log is specified. By default,
   • in cases where --dialog is not specified, write out the appIds list at the end of the operation
   • in cases where --dialog is specified, write Successfully wrote .dialog files to <out-folder>
   • write to console.error when there are any errors that prevent successful completion of the command
3. Replace --culture with --defaultculture
4. Add a --config <path-to-config>. This is the exact same luconfig.json that lubuild supported.

{
// CLI argument for --botName can be skipped if this is specified
    "name":"MyProject",
// CLI argument for --defaultCulture (--culture) can be skipped if this is specified. This is the application culture if a single .lu file is passed via --in. This is also the default culture for any .lu file without a lang-code in file name if a folder is passed in to --in. (e,.g. foo.lu will be foo.fr-fr.lu assuming --defaultCulture is set to fr-fr. This will continue to default to en-us
    "defaultLanguage":"en-us",
   // defaults to false when not specified. When set to true, old model version (when we create a new version) is automatically deleted for all applications
   "deleteOldVersion": true, 
   // absolute or relative path to set the output folder.
   "out": ".",
    // defaults to false when absent
    "writeDialogFiles": true,
    // each model is an application
    "models": [
        // each line is to an lu file and each line corresponds to a luis application. 
        "test/test.lu",
        "test/sample/x/Contoso.Foo.lu",
        "test/test.fr-fr.lu"
    ]
}