Bail from sunrise if wp-cli is in use

We'll be performing specific operations with wp-cli and won't need sunrise. If we do end up requiring it at some point, we'll need to put some logic in for what parts we do need.
Move our real sunrise into the proper wp-content directory
Move mu-plugins from old content directory to new wp-content directory

We'll want these to stay in place during provisioning.
Move object cache and install drop ins to new wp-content directory
Check for a valid WP_Role object before adding capabilities

During installation, roles aren't available yet and things break if we rely on them in mu-plugins
Introduce a WP_MULTI_NETWORK constant to account always indicate a multinetwork install
Merge pull request #6 from washingtonstateuniversity/6-platform-install

Allow for a default installation to occur with all platform files in place