Folders can now be unlinked and callbacks are optional on some APIs
fix optional JSDoc
fix JSDoc optional
Merge pull request #265 from adobe/jeff/unlink-folders-fs-optional

Folders can now be unlinked and callbacks are optional on some APIs
Minor refactoring in code that deletes files/folders.
Merge pull request #266 from adobe/glenn/code-cleanup

Minor refactoring in code that deletes files/folders.
debian packaging
Merge branch 'master' into linux
stub ShowSaveDialog method