Fix MorphTo (rebing#107)

* Fix MorphTo

MorphTo requires foreign key and foreign morph type

I tested and works

* Update SelectFields.php

Added file upload option

Added support for security rules

Add support for Unions (rebing#91)

* Add support for UnionType, refs rebing#63

* Extract Union functionality into extra class UnionType

* Add documentation for Union Types

Update Query.php (rebing#90)

* Update Query.php

Validation Rules should also apply to queries, just like it is for mutations.
The server should be able to catch validation errors and return proper messages whether the request is a query or a mutation.

* Update Field.php

* Update Query.php

* Update Mutation.php

Alias field (rebing#86)

Allow subscription types to be added (rebing#84)

Based on @petecoop's PR at the @Folkloreatelier repo (folkloreinc/laravel-graphql@70707ec).

Updating route and controller to give us the ability to create multi …

…level URI names (rebing#69)

* Updating route and controller so it give us the ability to create multi level URI names

Updating route and controller to give us the ability to create multi …

…level URI names (rebing#69)

* Updating route and controller so it give us the ability to create multi level URI names

Updating route and controller to give us the ability to create multi …

…level URI names (rebing#69)

* Updating route and controller so it give us the ability to create multi level URI names