Includes a case insensitivity change to given/surname_match, a new method called is_child() and documentation in the README for the undocumented methods.

I've also bumped the release number to 0.2.4dev

I'd propose that we drop the "dev" from the versioning so that when eventually pushed to the PyPI repository that these updates become "visible" to those users that install the Pip package. Currently the user needs to supply the --pre to the pip command line to find the updated python-gedcom package. As it currently stands there are not any releases available for python3 that can be installed without the --pre flag.