QPID-4892: Re-add the examples to the gemfile.
QPID-4842: Ruby spout.rb calls wrong API to set message properties.

Previously it was calling the read-only API (the one that returns an
array created from the underlying C++ code) rather than the method to
actually set values in the underlying C++.

git-svn-id: https://svn.apache.org/repos/asf/qpid/trunk@1482597 13f79535-47bb-0310-9956-ffa450edef68