make tutorials importable

.gitignore

MANIFEST.in

doc/Makefile

doc/source/images/_defs.py

doc/source/images/ab_ring.py.diff

doc/source/images/ab_ring_sketch.svg

doc/source/images/ab_ring_sketch2.svg

doc/source/images/band_structure.py.diff

doc/source/images/closed_system.py.diff

doc/source/images/generate-diffs.sh

doc/source/images/graphene.py.diff

doc/source/images/quantum_well.py.diff

doc/source/images/quantum_wire.py.diff

doc/source/images/spin_orbit.py.diff

doc/source/images/superconductor_band_structure.py.diff

doc/source/images/superconductor_transport.py.diff

doc/source/images/superconductor_transport_sketch.svg

doc/source/tutorial/ab_ring.py

doc/source/tutorial/band_structure.py

doc/source/tutorial/closed_system.py