added getApiVersion method to TypeScriptServicesFactory

src/services/services.ts

@@ -14,6 +14,9 @@
 /// <reference path='formatting.ts' />
 
 module ts {
+
+    export var ScriptAPIVersion = "1.4"
+
     export interface Node {
         getSourceFile(): SourceFile;
         getChildCount(sourceFile?: SourceFile): number;

src/services/shims.ts

@@ -867,6 +867,13 @@ module ts {
         private _shims: Shim[] = [];
         private documentRegistry: DocumentRegistry = createDocumentRegistry();
 
+        /*
+         * Returns script API version.
+         */
+        public getApiVersion(dummy: any): string {
+            return ScriptAPIVersion;
+        }
+
         public createLanguageServiceShim(host: LanguageServiceShimHost): LanguageServiceShim {
             try {
                 var hostAdapter = new LanguageServiceShimHostAdapter(host);