Fix file permissions on vimrc.

Change-Id: I15bbf46bde5b65c6033423586d71b789bfb29f96
Signed-off-by: Daniel Thompson <daniel@redfelineninja.org.uk>
Introduce .tmux.conf

Change-Id: I5fa0f147d1a9d4818970e3c00ea8229cc9996eaa
Signed-off-by: Daniel Thompson <daniel@redfelineninja.org.uk>