fix: use expected path when generating a domain

The `--directory` parameter is used to determine the path for the domain library, and was introduced in #35. This commit corrects its usage so that the `--directory` appears before the domain's name in the path instead of appearing after.

For example, this command:

ng g @angular-architects/ddd:domain user --directory=management

Will now generate the path `libs/management/user/domain` instead of `libs/user/management/domain`.

Fixes #79
Fixes #12

Author: sg-gdarnell

libs/ddd/src/schematics/domain/index.ts

@@ -33,7 +33,7 @@ export default function (options: DomainOptions): Rule {
 
   const libName = strings.dasherize(options.name);
   const libNameAndDirectory = options.directory
-    ? `${libName}/${options.directory}`
+    ? `${options.directory}/${libName}`
     : libName;
   const libNameAndDirectoryDasherized = strings
     .dasherize(libNameAndDirectory)