Provide a manual way of freeing objects, but set finalizers for them
in case the user does not want to worry about memory management, which
would be useful for commits or trees, which sare typically small.
When the objects are freed manually, the finalizer is unset to avoid
double-freeing, mimicking what the go runtime does.
It brings the data into go-land so we don't have to worry about the
commit being there. It stores the data we get from git and provides a
Time() function to get a time.Time struct.
Vicent Martí
Carlos Martín Nieto
Vicent Marti