Make deployments in the last week easier to understand

We already present today’s deployments as “today”: let’s add “yesterday” and “on Monday” for recent deployments to avoid having to go and look in a calendar to find out what today is.

![screen shot 2014-08-14 at 15 26 32](https://cloud.githubusercontent.com/assets/32775/3921220/34e13820-23bf-11e4-8362-c980250a0af2.png)