Test case for issue 39.

--HG--
branch : release-0.7
In UfuncVar.__init__(), move the combine_meta() call after Var.__init__().

Fixes issue 39.

In general, metadata should not be handled before Var.__init__() because it
will get wiped out.  Var.__init__() resets the entire object state, forgetting
any previous settings.

--HG--
branch : release-0.7
Release 0.7.2.

--HG--
branch : release-0.7
Added tag 0.7.2 for changeset c5cb753245f0

--HG--
branch : release-0.7
Merge in bug fixes from release-0.7.