Updating kvm.ps1 and kvm.sh scripts
Updated the grunt target to delete node_modules directory afterward
- It shelss out to "robocopy" tool as that is safe for long paths
- Doing this to work around the issue with KRE compile failing when long paths are present in the project folder
Skip calling clean-npm-modules from #run-grunt on Mono
Updating update-master to reset to release and copy NuGet.master.config to
repos
Get build and restore options from environment; provide set-quiet target
- see #123
- leaves default build unchanged
- run `build set-quiet default` for a much-quieter build
Address PR comments
- "K_build_options" -> "KPM_build_options" environment variable
- "K_build_options" -> "KPM_restore_options" (oops)
- "set-quiet" -> "--quiet" target

nit: remove trailing whitespace