* no_log parameter now surpressess data from callbacks/output as well as syslog
* ansible-galaxy install -f requirements.yml allows advanced options and installs from non-galaxy SCM sources and tarballs.
* command_warnings feature will warn about when usage of the shell/command module can be simplified to use core modules - this can be enabled in ansible.cfg
* new omit value can be used to leave off a parameter when not set, like so module_name: a=1 b={{ c | default(omit) }}, would not pass value for b (not even an empty value) if c was not set.
