DOC: updated gitignore
DOC: updated gitignore

Former-commit-id: 98921b7cf58fb542e80bb2a4dbe62fb1efdb6675 [formerly e64f79292340db1e6a050b23db3500c81db1c3ee]
Former-commit-id: 8dbb316ac753d365cdbada3c8b9498e19a53e6fb
Former-commit-id: 480410d9a520393c4ac182a3699ec9b630bcb1d0
neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox