Patch addBindingHandler to clone properties of config object
Merge pull request #201 from neverfox/pull-request/add-binding-handler

Patch addBindingHandler to clone properties of config object
Some more tweaks to composition.addBindingHandler.

Helping to ensure that "this" is correct from within the original
handler. Cleaning up some code, etc.
Fixed a margin bug in the dialog module.

Enabled nuget package restore on the .net samples.