MAIN-678 Removed bad reference to $this.
PLA-501 updated crosswikicore index service to always include description text
PLA-590 fix for warnings
PLA-590 get array param using explode
PLA-590 remove default value
PLA-590 remove unnecessary check
Merge branch 'PLA-590' into dev

Conflicts:
	includes/wikia/api/ArticlesApiController.class.php
Merge remote-tracking branch 'origin/dev' into dev