Strip and Timeline are back
While exporting Timeline, if there are no Nla Tracks use the current
active action. Once this action is frozen at least one track should
be present. Fixes #5.
Strip should work now. Added an offset to subtract the starting frame
when saving the animation. The previous strip is muted to prevent it
messing with the first frame.
Added some courtesy checks on object position, scale and rotation.
Rest position and Only keyed bones
Forced the armature to the rest pose while exporting the bones
(are armature.data.bones not in the rest position?).
Fixed #3 'Only keyed bones' option as suggested by Mike3D.