Edited Feature: File Properties are not preserved for content files [435]

Scenario: In my project I have a file with a Build Action that I would like to be preserved when I install the package. No file related properties appear to be preserved when installing a package.

Repro:

1. Add a file to the content folder of the project of a package
2. Specify a build action and/or other advanced properties that are written to the project file.
3. Create the package
4. Install the package into an application

Expected: File properties are preserved
Actual: No file properties are preserved

We should provide helpers for this as part of our helper library: http://nuget.codeplex.com/workitem/310

(Other keywords: Content Item, Content Properties)