Only set prompt dir if it has not already been set. Useful for overriding from shell init files.
Add precmd_update_git_vars to update the Git section before prompt renders
more pythonic way to find 'fatal' in string

use 'in' instead of find.
Merge remote-tracking branch 'xaq2892/master'
Revert "Only set prompt dir if it has not already been set. Useful for overriding from shell init files."

This reverts commit 50615c9e2de2e2f5fd890e6bc17f899e6d1cd4a6.
Merge branch 'master' of https://github.com/olivierverdier/zsh-git-prompt