Changed license name

Restore user module changes, to be refactored

Update docs

For Pi 2.4.0 release

Merge pull request pi-engine#1030 from pi-engine/develop

Added releasenote of 2.4.0

Updated version for release

Merge pull request pi-engine#535 from liuchuangww/user

Typo fix

Fix for action content capture

Updated uclient find API

Doc for 2.2.2 release