various additions from sim laptop

plugins/cdup/cdup.plugin.zsh

@@ -0,0 +1,20 @@
+
+_cdup() {
+	local dir=$1; shift
+	local targets=("$@")
+	for target in $targets; do
+		if [[ -e $dir/$target ]]; then
+			cd $dir
+			return 0
+		fi
+	done
+	if [[ $dir == "/" ]]; then return 1
+	else _cdup ${dir:h} ${targets[@]}
+	fi
+}
+
+cdup() {
+	if [[ ${#@} -gt 0 ]]; then _cdup ${PWD:h} "$@"
+	else _cdup ${PWD:h} .git .hg package.json build.sbt
+	fi
+}