Default value lost in binding.Obtain()

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Hello!

Today, fiddling with the binding.Obtain() I noticed that the default 
value gets lost.

In my application, I have a component tree and I want an attribute to be 
defined in any component in that tree, so I created binding:

 >     callback = binding.Obtain("callbackFunction", default=lambda arg: 
None)
 >

So, in case that no component defines a callbackFunction, the lambda 
function would be used as a fallback.
Unfortunately, "default" option is ignored unless target name contains 
slashes (e.g. "/callbackFunction", "./callBackFunction", 
"../callbackFunction")

I went to the peak/binding/components.py trying to fix it and propose 
the attached patch.
The problem is that default value was not propagated to the 
acquireComponent() call, so an exception occurred.


Best regards,
Alexey Smishlayev

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