Revert part of "update .gitignore"
Revert part of "update .gitignore"

This partly reverts commit bd52d77eadff1e5800928c67b80a2e34c07c2c8f.

MrTheodor/csg,MrTheodor/csg,votca/csg,MrTheodor/csg,MrTheodor/csg,votca/csg,votca/csg,MrTheodor/csg,votca/csg