Prevent extensions from using window.open() as a quick way to show the user
general, untrusted web content. Throw exception pointing out the 'right'
safe API to use. Still allows file: URLs and relative paths (which are by
definition file: too, and used by Debug > Run Tests).
Allow window.open() with about:blank too (one extenion is using this, and
it's generally useful for programmatically generated UI)
Created index.html in Dutch language

Index.html file for "Getting started" ("Aan de slag")
Little word replacement

A tip of @redmunds
Merge pull request #8436 from githrdw/patch-5

Created index.html in Dutch language
finish off Dutch Getting Started updates
Merge pull request #8669 from adobe/randy/pr-8435

Finish off Dutch Getting Started updates
fix unit test expectations now that indent bug was fixed
Merge pull request #8670 from adobe/randy/issue-8655

Fix Editor unit test
Merge pull request #8365 from adobe/pflynn/protect-window-open

Prevent window.open() from loading untrusted web content