Support cmd-a, c, x in native dialogs
- remove the dependency to package target to build a linux installer
Merge pull request #486 from adobe/release

Merge release branch back into master
Ensure selector sent only when CEF isn't wired up to handle it
Add undo redo
Use Cmd-Shift-Z as redo
Merge pull request #481 from anirudhsasikumar/fixselectall

Support cmd-a, c, v, x for text input in native dialogs like file open, save