Add support for other frameworks i.e. koa, hapi...

• Extract openapi-request-coercer
• Extract openapi-request-validator
• Extract openapi-default-setter
• Extract openapi-response-validator
• Extract openapi-security-handler
• Extract openapi-project-visitor
• Create koa-openapi
• Create hapi-openapi
• Create restify-openapi
• Create serverless-openapi

[jsdevel]

@h2non I’ll take a stab at an initial koa-openapi implementation tonight.

[jsdevel]

@h2non Just released koa-openapi@0.0.4 with #237. Has basic-usage covered. Need to write a solid README, but it mostly follows the conventions of express-openapi. See the bundled sample test for more info.