support javadoc generation
Set UndoBarController constructor to public, so you can use it in layout xml
Most of public method in UndoBarController has been deprecated, use undobar builder instead.
Use undobar builder  to show undobar
Support ImageSpan in undobar message.
Demo for supporting ImageSpan.
jump to 1.4
Merge branch 'master' of https://github.com/soarcn/UndoBar
Merge branch 'master' of https://github.com/soarcn/UndoBar
update comments