Adding test for #4511
Joins are an integral parat of a query, keeping them for count operations

Fixes #4511
Micro optimization, methods names are case insensitive.
Merge pull request #4514 from ADmad/3.0-model-finder

Micro optimization, methods names are case insensitive.
Merge pull request #4512 from cakephp/3.0-fix-contain-count

3.0 fix contain count