use namespaces instead of modules in the codebase

scripts/processDiagnosticMessages.ts

@@ -55,7 +55,7 @@ function buildInfoFileOutput(messageTable: InputDiagnosticMessageTable, nameMap:
         '// <auto-generated />\r\n' +
         '/// <reference path="types.ts" />\r\n' +
         '/* @internal */\r\n' +
-        'module ts {\r\n' +
+        'namespace ts {\r\n' +
         '    export var Diagnostics = {\r\n';
     var names = Utilities.getObjectKeys(messageTable);
     for (var i = 0; i < names.length; i++) {