[WIP] Talk Editor Redesign #331

Redesign of the Talk Editor according to work from the Finnish UX Team from the UCOSP 2013 Winter term.

See #331 and [331 subtasks](https://docs.google.com/document/d/16dRYJR_4edZj5-Oa5Ns9sC_uxS67tTwp5mDdfDGMAIg/edit)