Merge pull request #249 from NHNNEXT/dev

Dev
Merge pull request #250 from NHNNEXT/dev

submodule
Merge pull request #287 from NHNNEXT/dev

Dev
Merge pull request #387 from NHNNEXT/dev

12주 마무리
Merge branch 'dev'
hotfix
컴파일러 버전 1.8 -> 1.6으로 downgrade
Merge branch 'hotfix' into dev