This allows us to notice and report any regressions that have occured on
nightly, without requiring tests to pass on nightly for the entire build
to succeed.
The `fast_finish` flag will cause Travis to mark the build as successful
if the only builds still running are allowed to fail (e.g. `nightly`).
This allows us to manually inspect builds (or implement some form of
notifications) to see if any nightly regressions have occured, without
slowing down the overall build time.
This function isn't exactly useful, but it's working ffi with the
fontconfig library. Woo! Next step will be returning some objects with
more information (like font path so we can start rendering glyphs!).
