Fix : removing useless label in resize panel
Fix : Duplicate Current Frame bug (shift+n)

Events were not raised when using Duplicate current frame on
PublicPiskelController.
Change node webkit releases location, ignore unecessary files.
Merge branch 'master' of https://github.com/juliandescottes/piskel
Merge branch 'master' into fv-import-gm-fallback
code reviews