there is no static folder in pypi package 0.5.1

[JonahZeng]

thanks for your work, it helps me a lot.
when I use pip install flask-ckeditor， I found there is no static folder in Lib/site-packages/flask_ckeditor，so it doesn't work when I set CKEDITOR_SERVE_LOCAL=True. for chinese developer, cdn.ckeditor.com is blocked by GFW，so ckeditor.load() will fail by default setting CKEDITOR_SERVE_LOCAL=False.