Mono project check platform and call copy_plugins.sh
checking dir before copying to not yield errors
Fixing Gerrit project, checking platform
Fixing TeamCityIntegration NuGet.targets to case-sensitive
fixing GitUI nuget.target case sensitive
fixing GitUIPluginInterface nuget case sensitive
fixing Stash nuget case sensitive
Merge pull request #2130 from fraga/fixMonoBuild

Fix mono build