Log Message:
Update from version 0.86 to 0.90.

Upstream changes:

2008-12-29  Jarkko Hietaniemi  <jhi@iki.fi>

	* Storable deparse of coderefs for deep_copy() does not
	  work at all with 5.6.2: if modern enough Storable
	  and B::Deparse are not available, fall back to
	  the previous version which used Data::Dumper.

	* Release as 0.90.

2008-12-27  Jarkko Hietaniemi  <jhi@iki.fi>

	* Some PAUSE upload problem with 0.88, retrying.

	* Release as 0.89.

2008-12-26  Jarkko Hietaniemi  <jhi@iki.fi>

	* The 0.87 forgot to specify the Storable (and Safe,
	  used in the deserialization step of deep_copy)
	  prerequirement(s) in Makefile.PL.

	* Release as 0.88.

2008-12-26  Jarkko Hietaniemi  <jhi@iki.fi>

	* Addressed a performance problem in successors()
	  and predecessors(), reported by Jonathan Moore.

	* Reimplement deep_copy() by using Storable
	  freeze() and thaw() instead of Data::Dumper,
	  inspired by Jonathan Moore.  Probably now safer
	  and faster, but Storable is now a prerequirement.

	* Release as 0.87.