remove dashboard module

It seems like two pull requests already existed for this, but that they mistakenly removed a theme function that was still needed by admin/index. 

I have basically re-made those requests except have NOT removed that theme function (which I confirmed was definitely used by admin/index).

This is issue #14.

(Accept my apologies in advance, this is my first 'pull request' ever so let me know if I'm doing something wrong.)