Destroys UNC paths after URI#resolve

UNC paths are destroyed after calling the `URI#resolve` method:

https://github.com/AndersDJohnson/jackson-json-reference/blob/f7d247b3eaa14d92f8d45e6fe44ad3411d26e8e9/jackson-json-reference-core/src/main/java/me/andrz/jackson/JsonReferenceProcessor.java#L266

Example:

``` java

final URI baseUri = new File("//SERVER/some/path").toURI();
System.out.println(baseUri); // -> file:////SERVER/some/path (UNC-Path)

final URI resolved = baseUri.resolve("file.json#");
System.out.println(resolved); // -> file:/SERVER/some/file.json# (no UNC-Path)

```