Refactoring

Now views not responsible for updating parent model (models handle it,
as they should)

GlobalView and FormView deleted as unnecessary (all creation now in
main.coffee). Less hierarchy — simplier understanding.

BillingView introduced. It delete ugly ifs from AddressView (billing
redefine some methods,  when it needed).
EnchancedView introduces as ancestor of AddressView and CreditCard
view, it contains duplicated code for updating on select

Also, NestedModel is ancestor of CreditCard and Address models, it
handles  parent-update action and helper for validation (!empty)

Instead of GlobalView I bring new ErrorView and SendView, which
accordingly responsible for showing errors to user and sending final
model to server.

And removed unneded vendor files.