Move the reply toggle inline with share links

Dokku: \<pending\>

This offers a solution to #1518. As the two elements (reply toggle and share actions) are the same height and we know the bottom margins. We can use negative margins to pull the toggle up inline with the share actions.

![screen shot 2014-09-23 at 20 05 24](https://cloud.githubusercontent.com/assets/47144/4377171/38e0ccea-434c-11e4-98e4-dd33386af445.png)
Do you want to do this with `.thread-show-more`, too? I'm not convinced either way (and worry that regardless we may need a little responsive attention to these details), but just wanted to point it out in case it was an oversight.