Update version

Update version.

Add listener for sticky status.

Merge pull request alibaba#424 from alibaba/feature/performance_massdata

LayoutHelper核心链路性能优化

Merge branch 'develop'

# Conflicts:
#	examples/src/main/java/com/alibaba/android/vlayout/example/VLayoutActivity.java
#	vlayout/src/main/java/com/alibaba/android/vlayout/VirtualLayoutManager.java

Update version

Update version

add keep for api

update version

Update README-ch.md