Provide easier opt-out for Func<> binding

[BrunoJuchli]

Hi Remo
How about splitting the FuncModule into a FactoryModule (everything except .Bind(typeof(Func<...)) and a FuncFactoryModule?
This would allow for easier opt-out from Func<..>. The open Func<....> binding may hide issues with bindings when one wants to bind specific Func<MyFoo, MyBar>().

See http://stackoverflow.com/questions/24862138/stop-ninject-from-binding-funct-t-bool-automatically/24863850.

One could further provide an extension like

IBindingRoot.Bind<Func<MyFoo, MyBar>().ToFuncFactory();

or just

IBindingRoot.Bind<Func<MyFoo, MyBar>().ToFactory();

to simplify binding specific factories.

Please tell me whether you like the idea - in which case i'll happily provide pull request - or not.

EDIT: this is a duplicate of #21

[scott-xu]

That's what I thought. Let's move forward.