Log Message:
Update to 0.2.1:

2009-01-27  OZAWA Takuma

	* version 0.2.1 released.

	* README: fixed documents.

	* rbtree.c: ditto.

2009-01-23  OZAWA Takuma

	* rbtree.c (RETURN_ENUMERATOR): do nothing if rb_enumeratorize not
	defined.

	* rbtree.c (RBTREE_IN_ITERATION): removed. it has been not used.

	* rbtree.c (HAVE_RB_MARSHAL_LOAD, HAVE_RB_OBJ_INIT_COPY,
	HAVE_OBJECT_ALLOCATE, HAVE_RB_BLOCK_PROC, HAVE_RB_YIELD_VALUES):
	removed macros for Ruby 1.6.x.

	* extconf.rb (HAVE_RB_MARSHAL_LOAD, HAVE_RB_OBJ_INIT_COPY,
	HAVE_OBJECT_ALLOCATE, HAVE_RB_BLOCK_PROC, HAVE_RB_YIELD_VALUES):
	ditto.

	* rbtree.c (cmpint): removed a few codes for Ruby 1.6.x.

	* test.rb: ditto.

	* test.rb: (assert_raise): removed an alias for RubyUnit. use
	assert_raises.

	* extconf.rb: removed checking for inline keyword.

2009-01-21  OZAWA Takuma

	* extconf.rb: removed gcc options for portability. Thanks to
	Masatoshi SEKI.

2008-12-26  OZAWA Takuma

	* rbtree.c (rbtree_each, rbtree_each_pair, rbtree_each_key,
	rbtree_each_value, rbtree_reverse_each, rbtree_delete_if,
	rbtree_reject_bang, rbtree_select): Return an enumerator if no
	block is given.

2008-12-24  OZAWA Takuma

	* rbtree.c (rbtree_s_create): check and convert argument inner arrays (assocs) \ 
using #to_ary.

	* rbtree.c (rbtree_s_create): check and convert argument hash using #to_hash.

	* rbtree.c (rbtree_s_create): RBTree#[] now takes assocs as source of rbtree \ 
conversion.

	* rbtree.c (rbtree_to_hash): can't convert MultiRBTree to Hash.

	* rbtree.c (rbtree_s_create): can't convert MultiRBTree to RBTree.

	* rbtree.c (rbtree_s_create, rbtree_values_at): use long for loop counter \ 
instead of int.

2007-09-21  OZAWA Takuma

	* extconf.rb: no gcc options for mswin32.