Update python_tutorial.rst

removed repetitive info
FIX: Add step-down fix note
Merge pull request #1126 from christianmbrodbeck/parc-io

*.annot I/O
FIX: py3 compatibility
FIX: Py3k fix
ENH: Faster, clearer fwd accumulation
Merge pull request #1143 from Eric89GXL/clearer-fwd

ENH: Faster, clearer fwd accumulation
ENH : make EMS work
FIX : make sure bad epochs are dropped
Merge pull request #1091 from dengemann/ems_filtering

MRG: add ems filtering
FIX kit2fiff marker GUI:  when resetting also reset marker `use` parameter
Merge pull request #1145 from christianmbrodbeck/fix-gui

FIX kit2fiff marker GUI:  resetting
complete refactor
incorporated comments
returned examples piece
made examples a comment
FIX:contribute link
remove ease_install and github
Merge pull request #1140 from dgwakeman/getting_starter

adress issue 1139
cleanup viz