create threads (bug 946459)

Makes creating a new thread look like posting into a thread with 0 notes.

Depends on a Zamboni patch (which will be PR'ed in a bit).

## After

![screen shot 2013-12-13 at 1 58 27 pm](https://f.cloud.github.com/assets/674727/1746493/faf6f222-6441-11e3-892a-4931ed16a86b.png)

## Before

![screen shot 2013-12-13 at 2 01 22 pm](https://f.cloud.github.com/assets/674727/1746499/2224e25a-6442-11e3-864b-8716caa24abb.png)