Revert "implemented LeapFingr::Bone(Bone::Type)"

This reverts commit b8029a756c1e9d47a55f6ed5bbef97f55c184c66.
Revert "Revert "implemented LeapFingr::Bone(Bone::Type)""

This reverts commit e0643d86750c4e6b29a46c62e0dee4693fe0c574.