Add my repo for RabbitMQ stuff
Merge pull request #1893 from bct/directory-organization-fix

Make diagram of Directory Organization best practice match the text.
Update examples/ansible.cfg with sudo_exe
Merge pull request #1894 from ron1/devel

Update examples/ansible.cfg with sudo_exe
Merge pull request #1890 from elventear/rabbitmq_contrib

RabbitMQ Contrib
add pacman to list of package managers in setup module
Merge pull request #1897 from qjcg/pacman-pkg-mgr

Add pacman to list of package managers in setup module
Make env-setup work on Python 3
protect PluginLoader._extra_dirs from appending None

PluginLoader.add_directory() can receive None from, for example, 
Inventory.add_directory(self.basedir()) if host_list is a custom list.
None has no reasonable interpretation other than ignore it.
Merge pull request #1900 from bostrick/devel

protect PluginLoader._extra_dirs from appending None