Release SASS files to a separate subdirectory

[semekh]

Currently, installing [email protected] using npm results in a lib directory structure like this:

lib
├── javascripts
│   ├── ng-admin
│   ├── ng-admin.js
│   ├── ng-admin.js.map
│   ├── test
│   ├── vendors.js
│   └── vendors.js.map
├── ng-admin.scss
└── sb-admin.scss

Based on notes from Better Integration with Module Bundlers I assume both .scss files should be moved to a sass sub-directory.