OAS 3 and Swagger 2 Support in Validator

[gracekarina]

• [x] Based the validator in Inflector 3.0 Time 2 hr
• [x] write spec with 2 endpoints:
• [x] ReadUrl Time 4 hr
• [x] ReadContent Time 4 hr
• [x] DebugUrl Time 4 hr
• [x] DebugContent Time 4 hr
• [x] write controller Time 4 hr
• [x] write tests for the validator Time 6 hr

[gracekarina]

@webron this is the plan for validator badge :)

[gracekarina]

3.0 and 2.0 support can be found in 2.0 branch

[Gdewilde]

Thanks @gracekarina!