introduce video title search query service
Write tests for new video title search query service
updated Wikia\Search\QueryService\Factory and update tests
add video title search method to wikia search controller and update tests
updated documentation for video title query service
VID-145 added some request validation per @owend
VID-145 remove vacuously applying test code
Merge pull request #554 from Wikia/VID-145

Looks good!