DataDog/dd-agent — pull request #1263 by LeoCavaille (2014-12-26 14:28:53+00:00)
Title: Fix #1220. Add system.mem.pct_usable on windows

![screen shot 2014-12-26 at 3 24 50 pm](https://cloud.githubusercontent.com/assets/1788830/5557933/67dafaa0-8d13-11e4-98f0-fa21f9b5ac5a.png)