gitconfig: add graph alias.

Signed-off-by: brian m. carlson <sandals@crustytoothpaste.net>
vim: add a syntax highlighting file for Python.

This is a modified version of Debian's vim 2:7.4.335-1 Python syntax
highlighting file.  It marks the string delimiters as their own group, so
they can be highlighted independently.

Signed-off-by: brian m. carlson <sandals@crustytoothpaste.net>
ct_grey: highlight Python string delimiters.

Signed-off-by: brian m. carlson <sandals@crustytoothpaste.net>