Added _posts to gitignore.
Added _posts to gitignore.

artificialio/sane,IanVS/sane,kriswill/sane,ndufreche/sane,sane/sane,IanVS/sane,artificialio/sane,imfly/sane,codepreneur/sane,imfly/sane,sane/sane,devinus/sane,devinus/sane,codepreneur/sane,kriswill/sane,ndufreche/sane