add vertical_align to UnderlineContainer
Merge branch 'new_ui_code' of github.com:hwhw/kindlepdfviewer into new_ui_houqp
add width and invert to FrameContainer
add iconbutton widget
return true on iconbutton click event
first demo of touch menu
fix: set parent on TouchMenuItem
use touchmenu widget in readermenu
minor fixes, add TouchMenu example to wtest.lua
add resources for ReaderMenu
put menu item callback and closing ops to scheduler

Otherwise, inverted menu item will not be shown
Merge pull request #796 from chrox/new_ui_code

bugfix: fix loop scrolling at the beginning/end of the document
fix: properly initilize key_map for KT
fix: add empty Input.modifiers for KT from eureka
Merge pull request #797 from houqp/new_ui_fix

fix: properly initilize key_map for KT from eureka at mobileread
add submenu support for touchmenu
add LvDEBUG

so we can get rid of stack overflow when dumping a widget
add go back button to touchmenu
give a better name for parent
update wtest according to new touchmenu api