introspection for repeatable directive info (graphql-java#2113)

This moves the AST element builder to use immutable lists (graphql-ja…

…va#2101)

* This moves the AST element builder to use immutable lists with the ability to add items to individually

* Missing `directive` method

deploy this 14.x branch to bintray

add test for interface implemented with additional optional arguments

Introduce a GraphqlErrorException for Kotlin users and generally. (gr…

…aphql-java#1743)

* Introduce a GraphqlErrorException for Kotlin users and a as a general purpose exception that can be an error

* PR feedback and now more generic

Introduce a GraphqlErrorException for Kotlin users and generally. (gr…

…aphql-java#1743)

* Introduce a GraphqlErrorException for Kotlin users and a as a general purpose exception that can be an error

* PR feedback and now more generic

Allow and process DataFetcherResult as an item for GraphQL List fields.

fixes graphql-java#1524 (graphql-java#1525)

* fixes graphql-java#1524

* fixes graphql-java#1524

This fixes up the example code so it used CodeRegistry and also quick…

… rename of parameter names there

Merge pull request graphql-java#1445 from tsroka/visit-fragments

Add support for visiting fragment definitions in QueryVisitor.