added logic to add redirection when there is a typo in url
moved isWAMPage to model from hooks helper
added two new methods: getWAMSubpageUrl() and getWamPagesDbKeysMap(); added instance caching and moved here isWAMPage() method from hooks helper class
moved new logic to seperated method
performance change in getWAMSubpageUrl() method
removed unnecessary method
extracted Title::newFromText() to new method in favour of unit tests
added unit test for WAMPageModel::getWAMSubpageUrl()
fixed WAMPageModelText.php after manual marge conflict
Merge branch 'consumer-sprint37-bugid-100800' into dev