QPID-5250: Raise all exceptions within Ruby bindings.

Created a static definition for MessagingError in Ruby, then had all
thrown exceptions within the bindings extend that to maintain backwards
compatibility.

git-svn-id: https://svn.apache.org/repos/asf/qpid/trunk@1535795 13f79535-47bb-0310-9956-ffa450edef68