Update .gitignore (#475)
Update .gitignore (#475)

Merge pull request 475
cgerke/cgerke.github.io,jekyll/minima,jekyll/minima,cgerke/cgerke.github.io,Passw/Passw.github.io,horaceho/horaceho.github.io,Passw/Passw.github.io,cgerke/cgerke.github.io,jekyll/minima,horaceho/horaceho.github.io,Passw/Passw.github.io,horaceho/horaceho.github.io