Restore OMF-5 backward compatibility

* Map old bindProperty to setProperty, and issue a warning that it is deprecated;
* Don't complain about 'version' is deprecated and not supported;
* Use path instead of bin_path;

fixes: #1804

http://oml.mytestbed.net/issues/1804

Signed-off-by: Olivier Mehani <olivier.mehani@nicta.com.au>
Actually bindProperty is now supported in OMF 6. From my understanding, and from the example in http://oml.mytestbed.net/issues/1804, it is related to Prototype... which has been ported into 6. The definition of bindProperty is at omf_ec/lib/omf_ec/context/app_context.rb +115 under commit 77bad4d.