Internal site search

[tiborb]

The internal site search configuration is individual can not always be added to the config file.
A way of adding an internal search config on the fly is required.

Steps:

1. Load config from file (yml/json)
2. Add internal search config programatically
3. Pass config to the parser
4. Start parsing

e.g It can be implemented in the php version by adding a addReferer method to the ConfigFileReaderTrait or by making $referers protected.