Merge pull request AgoraIO#144 from AgoraIO/dev/android

fix android sdk version

Merge pull request AgoraIO#117 from AgoraIO/dev/3.3.0

Dev/3.3.0

fix bug

add privision profile for share extension

Merge remote-tracking branch 'origin/dev/3.1.0'

Merge pull request AgoraIO#48 from AgoraIO/dev/cjw

Dev/cjw

Former-commit-id: d5900f7