Merge tag 'v0.2.3' into develop

enhance zdk-input-date
FIX set value to "" or null
Add a clear method
fire a change event when date change
Add a simple example of zdk-input-date
Merge branch 'feature/zdk-input-date' into develop
change version to 0.2.4
use a core-icon for zdk-input-date
Typo : replace spaces by tab
Merge branch 'release/0.2.4'