Fix for issue: https://issues.jboss.org/browse/SRAMP-217

The s-ramp wagon now generates the maven-metadata.xml files dynamically
on request.  This allows features like <version>LATEST</version> to
properly work (along with better support for snapshot versions).
Merge pull request #313 from EricWittmann/sramp-217-maven-metadata.xml

(sramp-217) Generate maven meta-data XML files (wagon)