gitlog doesn't work with dynamically generated classes

[eywalker]

It appears that gitlog cannot be applied to dynamically generated classes, likely due to file path issue.

[eywalker]

As I suspected, this is triggered by the fact that the decorator inspects the class to discover the name of the file in which the class is defined. When used on dynamically generated class, this returns a path to a temporary file which is naturally part of a Git repo. It would make sense for gitlog to take in an optional argument that can directly specify path that is part of a Git repo (e.g. passing in __file__ from the context in which the class is dynamically generated). This also has the benefit of allowing the user to link the table class to be linked to an arbitrary Git repo of choice.