Support wildcards in NuGet package versions even though nuget.org hates them

[splatteredbits]

Currently, Whiskey won't let you use wildcard version numbers for NuGet packages because the nuget.org API doesn't/can't return all versions of a package when requested to do so. There are other NuGet-based package repositories, however, that do work (ProGet, MyGet, etc.). We should turn on support for this. If a package at that version isn't found, we should write an error message that reports that either that version doesn't exist or if they're using nuget.org as their default feed, it doesn't return all versions so you can't use wildcards.