Fix armature exporter. Not consider rotation.

armature_export.patch

--- armaturesys\armature_export.py.orig	2015-01-27 08:38:31.732200600 +0900
+++ armaturesys\armature_export.py	2017-08-01 18:33:26.455402600 +0900
@@ -275,19 +275,22 @@ class Armature():
             return correction_matrix * matrix
         elif (space == 'BONESPACE'):
             if bone.parent:
-                # not sure why extra = True is required here
-                # but if extra = extra then transforms are messed up, so keep
-                # for now
-                parinv = self.get_bone_rest_matrix(bone.parent, 'ARMATURESPACE',
-                                                   extra = True, tail = False)
-                parinv.invert()
-                return self.get_bone_rest_matrix(bone,
-                                                 'ARMATURESPACE',
-                                                 extra = extra,
-                                                 tail = tail) * parinv
+                matrix = mathutils.Matrix()
+                matrix.identity()
+
+                head_local = bone.head_local
+                parent_head_local = bone.parent.head_local
+
+                #
+                # translation
+                #
+                matrix[0][3] = head_local[0] - parent_head_local[0]
+                matrix[1][3] = head_local[1] - parent_head_local[1]
+                matrix[2][3] = head_local[2] - parent_head_local[2]
+
+                return matrix
             else:
-                return self.get_bone_rest_matrix(bone, 'ARMATURESPACE',
-                                                 extra = extra, tail = tail)
+                return self.get_bone_rest_matrix(bone, 'ARMATURESPACE', extra = extra, tail = tail)
         else:
             assert(False) # bug!