sync with master
sudo: fix cwd in sudo_execute
deploy: add deploy_application LWRP
systemd: fix disable action in user session resource
remove support for sysvinit, openrc, vserver and gitolite
fix systemd regressions and nagios checks
deploy: add deploy_rails_application resource
deploy: add migration support
zendns: use deploy cookbook instead of capistrano
rvm: use rvm 1.21
Merge branch 'next'

This release remove support for the following cookbooks:

 * gitolite
 * openrc
 * sysvinit
 * vserver

New Features:

 * improved deploy resource for ruby and rails
 * ZenDNS is now deployed by chef instead of capistrano
update changelog