vimrc: additions

* Make gitcommit files start on byte 0 no matter what.

* gitcommit file body wrapped at collumn 72.

* Fast escape.

* Commands timeout.

* Confirm exiting with unsaved changes.

Signed-off-by: Adrian-Tudor Panescu <adrian@panescu.com>

# Please enter the commit message for your changes. Lines starting
# with '#' will be ignored, and an empty message aborts the commit.
# On branch lithium
# Changes to be committed:
#   (use "git reset HEAD <file>..." to unstage)
#
#	modified:   vimrc
#