Open Radar

 
Summary:
The current version of the Playgrounds app supports document providers and uses `UIDocumentPickerModeImport` to import from other document providers like Dropbox, Git2Go or Transmit.

It would be much handier to just open a Swift Playground in-place and have the changes directly in Git2Go, rather than importing/exporting over and over.

Steps to Reproduce:
1. Open the playgrounds app
2. Import from a document provider
3. Make changes to the playground
4. Version in Swift Playgrounds changed but file in document provider is still the old one

Expected Results:
The version contained in the document provider should be changed.

Actual Results:
The version contained in the Swift Playground app changed.

Version:


Notes:
Many people would like to store their Swift Playgrounds in a Git app to version control them. The current version does not make it impossible, but not very handy either. It would be nice to support UIDocumentPickerModeOpen to resolve this usability issue