Github user aledsage commented on the issue:
https://github.com/apache/brooklyn-server/pull/500
@bostko see http://freemarker.org/docs/versions_2_3_25.html, in the section
"changes on the FTL side":
```
Extended the list directive to support listing hashes (such as Map-s), like
<#list map as k, v>${k}: ${v}</#list>, where k and v are the key and value in
the key-value pairs of the hash.
```
Also see http://freemarker.org/docs/versions_2_3_24.html, but I don't think
those changes relate to iterating over maps.
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