Add force option when removing folders

There is something like this without patch.

    Notice: /Stage[main]/Nginx/File[/opt/boxen/config/nginx]: Not removing directory; use 'force' to override
    Notice: /Stage[main]/Nginx/File[/opt/boxen/config/nginx]/ensure: removed
    Notice: /Stage[main]/Nginx/File[/opt/boxen/config/nginx/sites]: Not removing directory; use 'force' to override
    Notice: /Stage[main]/Nginx/File[/opt/boxen/config/nginx/sites]/ensure: removed
    Notice: /Stage[main]/Nginx/File[/opt/boxen/data/nginx]: Not removing directory; use 'force' to override
    Notice: /Stage[main]/Nginx/File[/opt/boxen/data/nginx]/ensure: removed
    Notice: /Stage[main]/Nginx/File[/opt/boxen/log/nginx]: Not removing directory; use 'force' to override
    Notice: /Stage[main]/Nginx/File[/opt/boxen/log/nginx]/ensure: removed