Maven properties do not allow for limitation on artifacts

When using the maven properties for milestone builds:

http://www.foundweekends.org/giter8/template.html#Maven+properties

The default.properties files looks in maven:

https://github.com/playframework/play-java-seed.g8/blob/master/src/main/g8/default.properties

```
description = This template generates a Play Java project
name = play-java-seed
organization=com.example
verbatim=*.css *.js *.png logback.xml gradle*
scala_version = 2.11.8
play_version=maven(com.typesafe.play, play_2.11)
```

but this comes out to 2.6.0-M1 because it picks up the milestone build. I'd like it to pick up only the 2.5.x branch, which is final.

Start with the Maven properties section of the Giter8 template documentation and reproduce the behavior using the referenced play-java-seed.g8 default.properties file. Trace how the maven(com.typesafe.play, play_2.11) value resolves artifacts. Done means Maven properties can limit resolution to the final 2.5.x branch instead of selecting 2.6.0-M1.

Written by the indexing model from the issue text.