* check method style if exists instead of binding style

[paulish]

Current implementation gets the method style from then binding definition while method can have different style than binding.

The new implementation gets the style first from the method and then from the binding if method has no style.

To fix the problem. I made several changes:

1. binding.topElements are created for any binding style but populated with elements of only 'document' style
2. moved methodName detection by soapAction from _executeMethod to _process and removed soapAction property from IExecuteMethodOptions which I added in previous patch.
3. added code to get style from the called method

I also added a test with an example.