[1.x] AXIOM dependency on core-databinding module

[Raymond Feng]

Hi,

When I debug the code yesterday, I found we now have AXIOM dependency in 
core-databinding module to register the OM adapter for JAXB. The 
core-databinding module is not the right place, we should refactor it into 
another module. We already have an XMLAdapterExtensionPoint and we could add 
some code to load the XmlAdapters using the tuscany-extensibility.

Thanks,
Raymond