v3.1.0

• Added collection of root_group, init_package, and cpu cores to the runner
• Added root_group to existing Linux systems
• Added Fedora 23, openSUSE Leap 42.1, and CentOS 7.2.1511
• Fixed malformed JSON in the Windows 2012 output
• Updated the runner and existing platform files to represent total memory in kB not MB as the default for Ohai has been changed on Windows / Linux
• Added cpu cores to all existing platform files
• Added a Rake task to validate the JSON of all platform files, and enabled Travis to run this task on every PR