Add the API version to the Mustache model when generating supporting files

[cb372]

This makes it easy to generate a client with version numbering in sync with the server's advertised API version.

[fehguy]

I think the same can be accomplished without a code change:

  additionalParams ++= Map(
    "artifactId" -> "swagger-petstore", 
    "artifactVersion" -> "1.0.0",
    "groupId" -> "com.wordnik")

Per this:
https://github.com/wordnik/swagger-codegen/blob/master/samples/client/petstore/java/JavaPetstoreCodegen.scala#L37-L40

and this:
https://github.com/wordnik/swagger-codegen/blob/master/src/main/resources/Java/pom.mustache#L4

[cb372]

That's true, but this change makes it easier to keep the client version in sync with the API version. Just change the API version once on the server, and the client version will automatically be updated next time you generate. I feel like this is a reasonable default behaviour.

Of course, there are cases where you want to version the client separately from the API, e.g. if you tweak the client code even though the API has not changed. In that case, the method you suggested works fine.

People may also want to generate a version number using a combination of the API version and additional params, e.g.:

additionalParams += ("minorVersion" -> "123")

<version>{{apiVersion}}.{{minorVersion}}</version>