Add FullTextRSS spout
Add needed libraries for FullTextRSS
Update AUTOLOAD for FullTextRSS libraries
Add configuration option to find site-specific extraction rules. Only needed in update.php
Update gitignore to exclude data/fulltextrss/standard
Update documentation so that people know how to install site-specific extraction rules
Add data directory to host site-specific extraction rules. Thay are not included by default. Please refer to README.md for more informations