started on 2.2.X release branch. official release will happen when we tag 2.2.0 in this branch.
Merge branch 'master' of github.com:qutip/qutip into qutip-2.2.X
Merge branch 'master' of github.com:qutip/qutip into qutip-2.2.X
Merge branch 'master' of github.com:qutip/qutip into qutip-2.2.X
Merge branch 'master' of github.com:qutip/qutip into qutip-2.2.X
close figures when demo is done