Nothing commit
Implement simple commit message checker

This is a start to the wrapping of libgit2 objects inside of C++
classes.

It also implements a simple program to check the 50/nl/72 of commits for
a specified repository. This functionality will be expanded upon and
'prettified' later on.
Merge pull request #1 from dwfait/libgit_experiments

Happy with current state of C++ wrapper classes for now.

Next up: stat tracking and prettification!