create missing output directory (refs #76)

Author: vojtechhabarta

typescript-generator-core/src/main/java/cz/habarta/typescript/generator/Output.java

@@ -31,6 +31,7 @@ public boolean shouldCloseWriter() {
 
     public static Output to(File file) {
         try {
+            file.getParentFile().mkdirs();
             return new Output(new OutputStreamWriter(new FileOutputStream(file), Charset.forName("UTF-8")), file.toString(), true);
         } catch (FileNotFoundException e) {
             throw new RuntimeException(e);