Handling upload of resources

[sbrossie]

Current code generation will create apis that specify the content (String) of the resource instead of the path. Example with uploading a catalog becomes:

    final String resourcePathName = ...
    final String resourcePath = Resources.getResource(resourcePathName).getPath();
    final File catalogFile = new File(resourcePath);
    final String body = Files.toString(catalogFile, Charset.forName("UTF-8"));
    catalogApi.uploadCatalogXml(body, requestOptions);