DOC: updated gitignore
DOC: updated gitignore

Former-commit-id: a6287e48e83a4a3795497b144ec5b6cb4b7ee211 [formerly 7d4da7fef460136ae4b313ded33c1c96b64804ed]
Former-commit-id: 38f4db81e1765296cbc7265a3c63c06ef0eaba44
Former-commit-id: 5356fb2d596c2f09e53ec1dd2ead6fe458d45062
neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox