[bd] API for XenForo 2.0 2.2.0 Beta 1

IMPORTANT information regarding conflict with XF2 api: If you use XF2 built-in API in any capacity, you will need to rename the `api` directory in the download package before uploading. You can skip this step if you do not plan to use the built-in API.

1. Rename it to anything, for example "awesome-api".
2. Add this line into your config.php file:

PHP:

$config['api']['apiDirName'] = "awesome-api";

You will need to repeat step 1 for each upgrade. Once again: renaming is optional and only required if you use XF2 built-in API.