Removed tonal colourings for tag lozenges 

Tags now only have tonal colourings on live blogs & gallery pages, all other tags are grey.

This also pulls in pasteup-buttons release 0.4.7

![screen shot 2014-10-03 at 17 29 18](https://cloud.githubusercontent.com/assets/2236852/4509199/e4fe1d48-4b1c-11e4-9ddb-e3f1e7ff78fa.png)