Allow interpolation expressions which can access array, lists and maps.

[belingueres]

Update ReflectionValueExtractor source code with a more up to date implementation allowing access to array, list and map elements.

This is in order to solve:
https://issues.apache.org/jira/browse/MWAR-303
which uses maven-filtering, which in turn uses plexus-interpolation.

(Will contribute a fix to this.)

TIA,
Gabriel

[khmarbaise]

Great...to hear that...