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.
Can a test be added to do something more substantial than e.g. `--version` or `--help`? See `cmake.rb` for an example of an application formula with a good test and `tinyxml2.rb` for an example of a library formula with a good test. Thanks!