* Fix collections attachments.

If you will try to attach model simultaneously to a collection of related models, you'll crash your app, because this method will try to operate with models themselves but not with their ids.

This change considers every case and fixes collections relations.

* Fix typo

* Fixes #789

* StyleCI fixes

* StyleCI fixes

* StyleCI fixes

Laravel 5.3 support currently is available for 3.1.0-alpha release only!

* Adding sparce & unique indices

Provides a handy workaround for issue 556.

* Code styling fix

This addresses the issues highlighted in the StyleCI analysis.

5.3 UnitTests

updated config file path

Initial support laravel 5.3

New Laravel queries always return collection. this is a backward compatible enhancement as Collections can be used as Arrays!

Rename belongs to many keys