paket pack should pretty-print nuspec

[agross]

The nuspec in the nupkg is pretty much one long line which makes is very hard to read/manually verify. It would be great if it would be pretty-printed like the modifications made to the *.??projs.

//cc @mavnn

[agross]

OK, it's not a single line (found only after adding more metadata), but it's formatted rather strangely:

<?xml version="1.0" encoding="utf-8" standalone="yes"?><package xmlns="http://schemas.microsoft.com/packaging/2011/10/nuspec.xsd"><metadata><id>GROSSWEBER.Angebot.Contracts</id><version>1.2.1-no SHA</version><title>grossweber.com Angebot contracts
</title><authors>GROSSWEBER</authors><projectUrl>http://grossweber.com/
</projectUrl><iconUrl>http://grossweber.com/favicon.ico
</iconUrl><description>Contracts to talk to the Angebot service
</description><copyright>Copyright GROSSWEBER. All rights reserved.
</copyright></metadata></package>

[mavnn]

This should just be a case of finding the right option on the xml writer.