Merge pull request #41 from mallowlabs/id/38

Fixed: APNS did not notify to room owners refs #38
flexible omniauth initializer refs #42
refactoring: simplify authorization process refs #42
Merge pull request #43 from shimomura1004/id/42

allow Hash args for omniauth provider Id/42
invite more than one users to private room at one time refs #44
refactoring: more effective loop refs #44
Merge pull request #45 from shimomura1004/id/44

refs #44
Added: Ruby 2.0.0 to Travis CI refs #34
Fixed: a broken test on Ruby 2.0.0 refs #34