Merge branch 'release/3.0'
Merge branch 'release/3.1-beta'
Merge branch 'release/3.1.0-beta.2'
#3 Naver Syndication API v2 대응, version 4.0.0-beta.1
Merge branch 'develop' of https://github.com/xpressengine/xe-module-syndication into develop