Update documentation

Author: FooBarWidget

CONTRIBUTING.md

@@ -2,4 +2,6 @@ Hey, thanks for wanting to contribute to baseimage-docker. :)
 
 If you have a question, please use the [discussion forum](https://groups.google.com/d/forum/passenger-docker). The Github issue tracker is only for **bug reports and feature requests**.
 
-If you want to develop baseimage-docker, use the Vagrantfile in the repository. It will setup an Ubuntu VM with Docker installed in it. Use the Makefile to build the image.
+If you want to develop baseimage-docker, use the Vagrantfile in the repository. It will setup an Ubuntu VM with Docker installed in it. Use the Makefile to build the Docker image.
+
+All development happens on the `next` branch. The `master` branch is supposed to point to the latest stable release, because users read documentation from the `master` branch.

Changelog.md

@@ -6,6 +6,7 @@
  * Logrotate now reloads syslog-ng properly. Closes GH-167.
  * Fixed some locale issues. Closes GH-178. Thanks to David J. M. Karlsen.
  * Fixed problems with cron. Closes GH-115.
+ * Contribution by Bryan Bishop.
 
 ## 0.9.15 (release date: 2014-10-03)