add poller-wrapper
add appropriate line
Change crontab to use poller-wrapper by default
update install instructions for poller-wrapper
Merge branch 'master' into wrapper

Conflicts:
	config.php.default
	librenms.cron
Replace poller-wrapper with exact version from https://github.com/Atrato/observium-poller-wrapper
Load defaults in wrapper
Fix branding on poller-wrapper
Merge branch 'wrapper' of github.com:librenms/librenms into wrapper