Make capability filterable

Hi,

to be able to enable the cookie and to change the text, one has to have the ‘manage_options’ capability. So, basically only an administrator can do this.

Our clients don’t have this capability, and thus, cannot edit the cookie.

Would it be a nice feature to let the capability be filterable, so one can change this accordingly.

I’ve just made a pull request for this request: https://github.com/webgrafia/ginger/pull/3

Thanks

Edwin