v3.12.0 (#4282)

* Use `parameterWithMeta` to get parameter data in <ParameterRow>

* Prefer specPath when fetching resolved subtrees in OperationContainer

* Add test for OAS3 callback rendering

* Remove debugger statement

* Pass base resolution URL directly to Swagger-Client subtree resolver

* Remove accidental comment

* Migrate additional options

* Don't default to empty Map when getting subtree

* fix(validateParam): check for ImList type before using count method

* Use `replaceState` to update `urls.primaryName`

This gives us the stateful URL we want, without:
(a) refreshing the page on update
(b) creating a long, useless history for the user
(c) implying that browser history is two-way bound
    to Swagger-UI (it isn't, we don't have a router)

* Add `fn.opsFilter` docs and internal API versioning note

* restrict `x-example` functionality to Swagger 2.0

* polish Authorize + Close buttons

* add tachyons; use it for padding the new Reset button

* v3.12.0

* rebuild dist

README.md

@@ -22,7 +22,7 @@ The OpenAPI Specification has undergone 5 revisions since initial creation in 20
 
 Swagger UI Version | Release Date | OpenAPI Spec compatibility | Notes
 ------------------ | ------------ | -------------------------- | -----
-3.11.0 | 2018-02-09 | 2.0, 3.0 | [tag v3.11.0](https://github.com/swagger-api/swagger-ui/tree/v3.11.0)
+3.12.0 | 2018-03-02 | 2.0, 3.0 | [tag v3.12.0](https://github.com/swagger-api/swagger-ui/tree/v3.12.0)
 3.0.21 | 2017-07-26 | 2.0 | [tag v3.0.21](https://github.com/swagger-api/swagger-ui/tree/v3.0.21)
 2.2.10 | 2017-01-04 | 1.1, 1.2, 2.0 | [tag v2.2.10](https://github.com/swagger-api/swagger-ui/tree/v2.2.10)
 2.1.5 | 2016-07-20 | 1.1, 1.2, 2.0 | [tag v2.1.5](https://github.com/swagger-api/swagger-ui/tree/v2.1.5)