ADEN-1205 Clean up the GPT slot map
ADEN-1205 Variable in DefaultSettings.php
ADEN-1205 Added a unit test for wgAdDriverUseCoffeCup
ADEN-1205 Allow below the fold slots to call DART
ADEN-1205 wgAdDriverUseCoffeeCup -> wgAdDriverUseDartForSlotsBelowTheFold
ADEN-1205 CR changes
Merge pull request #3834 from Wikia/aden-1205-more-gpt-slots

ADEN-1205 Allow below the fold slots to call DART