Released version 2.2.2

Fixed

• Updated selenium version to 2.52.0
• Fixed rules overriding and added more informative error message in case there was error inside rule
• Installation script for Mac. Now it creates a symlink in /usr/local/bin/galen
• Fixed default functions replacement when using $page in GalenPages
• Added 'singleline' text operation for text validation
• Added 2 pixels error rate in spec 'inside' when checking that the element is not completely inside another element