Added runtests.jl file to address #120

I also renamed the files to hopefully indicate the contents.

On my system the test fails if I include "glib.jl" (previously "glib_tests.jl")..  I wasn't sure if that indicates something needs to be fixed, or if the glib.jl is out of date?

I can comment out that include("glib.jl") line if you don't want the test failing immediately...