Revert "Vim: Remove configuration that close Vim if the only window left open is NERDTree"

This reverts commit 04c3291be44c8a9fc03bccae2ea556642a687b66.
Vim: Replace vim-autoclose with delimitMate b/c vim-autoclose conflicts with YouCompleteMe
Vim: Improve snippet for Pelican to remove punctuations from article slug

It also make slug lowercase.

I can't use tranlate(None, string.punctuation) b/c string.translate()
doesn't work with Unicode data.
Vim: Fix a bug in Pelican snippet

Pelican accepts 4 digit year in dates.