Added git diff for vim (gdv)

lib/aliases.zsh

@@ -20,6 +20,7 @@ alias gst='git status'
 alias gl='git pull'
 alias gp='git push'
 alias gd='git diff | mate'
+alias gdv='git diff -w "$@" | vim -R -'
 alias gc='git commit -v'
 alias gca='git commit -v -a'
 alias gb='git branch'