Updates to JMSBindingContext & JMSBindingProcessor to allow for additional extensions.

The following updates should be made to allow the JMS Binding to allow for additional extensions:

1) Add a HashTable to JMSBindingContext which allow extensions to set/get java.lang.Object based upon a string key.
2) Update JMSBindingProcessor.read() to allow for the extension processor to resolve models for wireformats and operation selectors.