fix nginx restart command.
update /groups/search logic.
Merge branch 'dev' into hbzhou
Merge branch 'dev' into hbzhou
Merge branch 'hbzhou' of github.com:/us4us/seed into hbzhou
Fix checkout/create bug.

As input parameter is attendees:["id"=>1, "id"=>2], so we should get attendees by each_attandees["id"].