Option to use main window window.history

[tchiotludo]

I've added an option to use window.history instead of iframe history. This is needed by google tag manager & facebook pixel, they overload some method window.history method in order to track new change. Without this options, these pixel are unusable with spf application

To be honest, I don't understand the reason of using an iframe :smile:

[rviscomi]

I'll defer to @nicksay but I think the iframe was used to get a clean copy of the web APIs that may have been mangled (accidentally or otherwise) in the global scope of the window by other libraries.

[zz22zz222]

no

[undefined123456]

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