[VS Addin] Cleanup create_package.py Seperate staging of resource from creating archive. This makes it far clearer what exactly ends up on the final archive (i.e. the exact contents of the staging folder). TEST=verify resulting archive has same contents. [email protected] Review URL: https://codereview.chromium.org/588423002 git-svn-id: https://nativeclient-sdk.googlecode.com/svn/trunk/src@1577 050acbb0-2703-11df-ab0a-9f3f633ae91d