libgit2-glib 0.0.24 (new formula)

New formula for libgit2-glib.

Despite the tiny version number, the software itself is actually a year and a half old with 12 stable releases.
Changed my mind. Found some examples upstream. Slight problem, the examples seem to be 200 lines of code complied into a binary each, so I've just installed those examples in ` libexec ` and I'll use one of them for testing purposes.

Added a test. Let me know what you think.