Create a schema with custom directives first change for #156

[MarcoFuykschot]

modified:   juniper/src/lib.rs
modified:   juniper/src/schema/model.rs

(feat) create schema with custom directives

First change for #156

[tyranron]

@MarcoFuykschot

First change for #156

Could you provide some grand vision/description of how it's supposed to work? And what would be the next steps?

From the provided example in the code and PR description, it's not very clear.

[MarcoFuykschot]

@MarcoFuykschot

First change for #156

Could you provide some grand vision/description of how it's supposed to work? And what would be the next steps?

From the provided example in the code and PR description, it's not very clear.

Step 1: is allow custom directives, added to a schema to pass validation.
Step 2: Update graphql parser to support directive definitions
Step 3: Create a mechanisme for user code to react on directives during execution.