fixed CocoStudio SceneTest crash when it quits.
added code to handle backbutton press on rendering thread
removed sap file
fixed typo in comment
added XAML messagebox support for CCMessageBox
merge from updated master
refactored wp8 CCEditBox to fix broken WP8 C++ builds
updated wp8-xaml template
set m_eResolutionPolicy = kResolutionShowAll if it is kResolutionUnKnown
add CopyTemplateFiles project to update wp8-xaml cpp template files
add CopyTemplateFiles project to update wp8-xaml cpp template files
only need size of Drawing Surface. Added comments
use WindowBounds for sizing
use WindowBounds for sizing
added ignore C++ warning 4251
updated template file
use getScaledDPIValue() for WP8 C++ version
Merge pull request #5478 from MSOpenTech/wp8-backbutton

WP8 backbutton fix
Merge pull request #5465 from chengstory/fixesSceneTestCrash

fixed CocoStudio SceneTest crash when it quits.
Update CHANGELOG [ci skip]