Made curl async and defaulted callbacks
append AboutScreenControl extension
update the readme of this extension
bug fix#1

fix barcode scanner would not read if there is a space in the text with
character conversion
Revert "bug fix#1"

This reverts commit 2a779285ea2cd2db9de49c95a78769bdef7d0c4a.
Revert "Revert "bug fix#1""

This reverts commit d5c9a32a21308851a1d898e0e6b810229229f6af.
Revert "Revert "Revert "bug fix#1"""

This reverts commit 27291eebfa06e0f34fef9062ae3c11a7b93d2423.
bug fix# 2

complete fix for space in string problem
Updated the test app and added openApplink() test.
Replaced success and fail callbakcs to onDone
Create LICENSE 

append a license file according to official requierment
Update AboutScreenConfig.java
Update AboutScreenExtension.java
Update AboutScreenNamespace.java
Update Languages.java
Update ShowAboutScreen.java
Update LICENSE
update license again.....
Merge pull request #324 from Walkline80/master

append a new control: AboutScreen Control
Merge pull request #325 from t470520/master

bug fix #2