move utils.sh to lib

lib/utils.sh

@@ -0,0 +1,9 @@
+# http://stackoverflow.com/a/1369211/183097
+copy_function () {
+  declare -F $1 > /dev/null || return 1
+  eval "$(echo "${2}()"; declare -f ${1} | tail -n +2)"
+}
+
+is_function () {
+  [ "`type -t $1`" == 'function' ]
+}