This addresses part of #1623. Unfortunately, because the CLI takes Nuget
as a binary, it is hard to get to where I think we should really be.
This change makes default verbosity "minimal", which is the first level
where you get any status output. Unfortunately, things like package
downgrade warnings and the like still appear there. This does hide all
the "info" and "trace" messages by default.
I also removed the now useless (and previously undocumented)
--quiet.
Also removed the dependency on Microsoft.Extensions.CommandLineUtils.Sources NuGet package and instead just checking the source files into our repo as internal classes.
Fix#2526
Update .exe's project.json Target Framework from dnxcore50 to netstandardapp1.5.
Update .dll's project.json Target Framework from dnxcore50 to netstandard1.3.
Adding workaround for DataContractSerialization to src\dotnet\project.json to fix crossgen issue.
Build 23901 has a dependency issue that doesn't allow the runtime.any.System.Private.DataContractSerialization
package to be restored. When we move to a new build of CoreFX we should take this workaround out.
