(GH-60) Fix: Pin errors on pkg folders w/versions

If the package folder has a version on it, it is considered a side by
side path, so the package manager may not be able to resolve the path
to the locally installed nupkg. When it isn't found by regular means,
attempt to find it by looking for it in side by side paths. If it is
not found there either, go ahead and error.

src/chocolatey/infrastructure.app/commands/ChocolateyPinCommand.cs

@@ -159,7 +159,17 @@ public void set_pin(IPackageManager packageManager, ChocolateyConfiguration conf
             IPackage installedPackage = packageManager.LocalRepository.FindPackage(config.PinCommand.Name, semanticVersion);
             if (installedPackage == null)
             {
-                throw new ApplicationException("Unable to find package named '{0}'{1} to pin. Please check to ensure it is installed.".format_with(config.PinCommand.Name, versionUnspecified ? "" : " (version '{0}')".format_with(config.Version)));
+                var pathResolver = packageManager.PathResolver as ChocolateyPackagePathResolver;
+                if (pathResolver != null)
+                {
+                    pathResolver.UseSideBySidePaths = true;
+                    installedPackage = packageManager.LocalRepository.FindPackage(config.PinCommand.Name, semanticVersion);
+                }
+
+                if (installedPackage == null)
+                {
+                    throw new ApplicationException("Unable to find package named '{0}'{1} to pin. Please check to ensure it is installed.".format_with(config.PinCommand.Name, versionUnspecified ? "" : " (version '{0}')".format_with(config.Version)));
+                }
             }
 
             var pkgInfo = _packageInfoService.get_package_information(installedPackage);