Revert "Add some gtags map."

This reverts commit 14172c6294c6d91401aab5880570d0895bcbceed.
Revert "Add vundle a.vim"

This reverts commit 94761b2de43ce16dbc42b77ff2d7b2ef8f0e86e9.
Revert "Add 80 cols ruler."

This reverts commit 4d9c0bf3bce65f7f8f870778aacebec096107d1a.