When `New-Release` doesn't specify a project, iterate the full collection

[shiftkey]

Citation:

https://github.com/github/Shimmer/blob/master/specs/Tools.md

1. Call $DTE to build the current project, including the NuGet packages
2. Look at all of the projects which have references to Shimmer.Client
3. Look up the build output directory for those projects, run CreateReleasePackage.exe on all of the .nupkg files

Two reasons this is neat:

1. Perhaps you have multiple applications to ship
2. The "use the current project" thing from NuGet is a crutch

What you could actually do is scan for any .nupkg files in all the build outputs, rather than check for project references (or the packages.config entries)

[peters]

https://github.com/github/Shimmer/issues/123