Member functions now work as well for set_function. If performance of `new`ing a type ever becomes too large, we can create a custom allocator for the std::shared_ptr's of the types. We can also up-front allocate for the unordered_map as well.
It'll be up to @Rapptz's to make further changes to make sure GCC compiles, but the core of the functionality is there and my work is essentially done.
Class bindings are up next, but really I don't want to even touch those. :c
