update pkgwat to 0.1.2

This pull request allows me to mock pkgwat 0.1.2 on F19.

I've dropped the json and nokogiri version numbers with the hope that https://github.com/daviddavis/pkgwat/pull/14 will be merged upstream. If it does get merged, we'll need to update the package again; if it does not, we'll need to carry that patch.