Update changelog
Merge branch 'master' of https://github.com/WindowsAzure/WALinuxAgent

# By Eric Gable
# Via Eric Gable
* 'master' of https://github.com/WindowsAzure/WALinuxAgent:
  From: commit ae46e33b8ecb8e5719713738134ef62cc8975f00 Author: Eric Gable <v-ericg@microsoft.com> Date: Tue Aug 6 16:28:41 2013 -0700
  Hand merge from merge request: commit d11b6f7dd7f7f496d192cf616822ec880a12f59c 1 parent b16902d Author: rjschwei authored 22 days ago