Merge pull request swagger-api#3600 from swagger-api/version-docs

Version docs

docs/version-detection.md

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+# Detecting your Swagger-UI version
+
+At times, you're going to need to know which version of Swagger-UI you use. 
+
+The first step would be to detect which major version you currently use, as the method of detecting the version has changed. If your Swagger-UI has been heavily modified and you cannot detect from the look and feel which major version you use, you'd have to try both methods to get the exact version.
+
+To help you visually detect which version you're using, we've included supporting images.
+
+
+# Swagger-UI 3.X
+
+![Swagger-UI 3](images/swagger-ui3.png)
+
+Some distinct identifiers to Swagger-UI 3.X:
+- The API version appears as a badge next to its title.
+- If there are schemes or authorizations, they'd appear in a bar above the operations.
+- Try it out functionality is not enabled by default.
+- All the response codes in the operations appear at after the parameters.
+- There's a models section after the operations.
+
+If you've determined this is the version you have, to find the exact version:
+- Open your browser's web console (changes between browsers)
+- Type `versions` in the console and execute the call.
+- You might need to expand the result, until you get a string similar to `swaggerUi : Object { version: "3.1.6", gitRevision: "g786cd47", gitDirty: true, … }`.
+- The version taken from that example would be `3.1.6`.
+
+Note: This functionality was added in 3.0.8. If you're unable to execute it, you're likely to use an older version, and in that case the first step would be to upgrade.
+
+
+# Swagger-UI 2.X and under
+
+![Swagger-UI 2](images/swagger-ui2.png)
+
+Some distinct identifiers to Swagger-UI 3.X:
+- The API version appears at the bottom of the page.
+- Schemes are not rendered.
+- Authorization, if rendered, will appear next to the navigation bar.
+- Try it out functionality is enabled by default.
+- The successful response code would appear above the parameters, the rest below them.
+- There's no models section after the operations.
+
+If you've determined this is the version you have, to find the exact version:
+- Navigate to the sources of the UI. Either on your disk or via the view page source functionality in your browser.
+- Find an open the `swagger-ui.js`
+- At the top of the page, there would be a comment containing the exact version of swagger-ui. This example shows version `2.2.9`:
+
+```
+/**
+ * swagger-ui - Swagger UI is a dependency-free collection of HTML, JavaScript, and CSS assets that dynamically generate beautiful documentation from a Swagger-compliant API
+ * @version v2.2.9
+ * @link http://swagger.io
+ * @license Apache-2.0
+ */
+ ```