Support for std::unique_ptr parameters

[Kevin Stenerson]

I'd like support for std::unique_ptr<T> parameters (and probably eventually retvals, but will get to that later).

A unique pointer can act like a normal CppClassPtrParameter, except for the following:

 - It shouldn't be used with RefCountedMemoryPolicy
 - It should behave like transfer_ownership is always true
 - It should have a pointer_name like 'std::unique_ptr< T_full_name >`
 - It needs to be passed as an argument with `move(value_ptr)` instead of just `value_ptr`

Hopefully those are all of the important cases.

I've attached a patch that I believe implements it correctly.

Unfourtenately, no unittests or examples this time >_<.