Never show 'division number' in division heading

On policy vote details, division edit, and division edits show the division number was getting inserted into the heading. This removes that in all cases. Changing:

> Bills — Migration Legislation Amendment Bill (No. 1) 2014; Second Reading — 3 Sep 2014 — Division No. 2 

to

> Bills — Migration Legislation Amendment Bill (No. 1) 2014; Second Reading — 3 Sep 2014

closes #416