Handle project dependencies when packing

All project dependencies are included in the final nuget package as if
there was one big project.

- All dlls/pdb/exe files are added
- All other content files are added
- All dependencies are merged

Caveats:
- You need to make sure your file names/paths won't clash, because they
all go to the same package in the end (source files, dll files...)
- You need to make sure all your dependencies are coherent within your
solution
Add a unit test that was missed in code review http://codeflow/Dashboard/review/display/feiling-f21111a9fe7b40bc92f8512116bc0f2c
Adding ignore directive for .DS_Store (common junk added by OS X)
Fixes most of the PathSeparator test issues under Un*x systems.
adding forgotten test utility class.
Fixed environment newline difference for Un*x vs. DOS, fixes 27 tests.
Fixed environment newline difference for Un*x vs. DOS, fixes 27 tests.
Fixed the last ZipPackageTest
removed spurious .Replace
fixed leading indent on PackageUtility.cs
Merge branch 'master' of https://git01.codeplex.com/nuget
//        Project.Object.References.Item requires Reference.Identity
//        which is, the Assembly name without path or extension
//        But, we pass in the assembly file name. And, this works for
//        almost all the assemblies since Assembly Name is the same as the assembly file name
//        In case of F#, the input parameter is case-sensitive as well
//        Hence, an override is added to perform as case-insensitive search
//        if required
fixed the tabs.
Fixing const -> readonly declaration, which required it to be made static, too. Duh.
Adding support for Azure projects
Allowing files/folders to be deleted from the physical file system of an Azure project
Ensuring files or folders cannot be added to an Azure project
Web or App config files are no longer treated as supported to avoid adding them to the Azure project folder because they don't make sense in an Azure project
Fixing formatting
Fixing formatting to match coding standards.