We're not at 100% coverage yet, so do not enable the test by default.

I'm in awe with how many bugs this test revealed.  All fixed.

Now the test/object test deadlocks as expected.  Fix coming.

Step version up to 0.5.0.

Also, fix to pass "make distcheck"

Revealed many bugs in the (untested and known buggy) user_data
support.

Wraps around glib for convenience and ease of use.

Unicode data providers can now be subclassed, including support for
chain-up.  The interface should now be nicely bindable, as well.

Also fix glib unicode funcs that where broken after hb_script_t
changes.  Nicely caught by the test-unicode.c added in this commit.

Uses the glib testing framework.  Wrote unit tests for hb-common.h
types.