show properties for all files
merge upstream/master
compressed sample's images
Merge pull request #1265 from devoncarew/master

compressed sample's images
Merge pull request #1264 from sunglim/properties-dlg

show properties for all files
re-size the cannot launch dialog
Merge pull request #1267 from devoncarew/master

re-size the cannot launch dialog
Fix warning from Dart Editor
Merge pull request #1273 from sunglim/warning_fix

Fix warning from Dart Editor