Fix issue in the parsing of tsConfig file, this was fixed in master before, but never ported.

The realizeDiagnosticS function already returns an array, no need to wrap again. The realizeDiagnostic (no S) function returns a single diagnostic.

src/services/shims.ts

@@ -893,7 +893,7 @@ module ts {
                     return {
                         options: configFile.options,
                         files: configFile.fileNames,
-                        errors: [realizeDiagnostics(configFile.errors, '\r\n')]
+                        errors: realizeDiagnostics(configFile.errors, '\r\n')
                     };
                 });
         }