Added new script for non manual updating stuff directories

Added README.md for describing the purpoces of scripts

bin/README.md

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+## Simple scripts for routine actions
+### check_replication_lag.pl
+
+### generate_pgbouncer_userlist.sh
+
+### slony_extract_schema_to_file.sh
+
+### stuff-update.sh
+This script updates your cloned pg_utils on actual state& There are few ways for cloning repository.
+* git pull - just pulls new changes into local directory
+* wget/curl - downloads and unpacks repository in zip archive and unpack it into local directory

bin/stuff-update.sh

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+#!/bin/bash
+
+# Getting full path of script
+stuff_dir=`pwd`
+if [ `dirname $0` != '.' ]; then
+  stuff_dir=$stuff_dir/`dirname $0`
+  stuff_dir=`dirname $stuff_dir`
+fi
+prestuff_dir=`dirname $stuff_dir`
+echo Expected stuff directory: $stuff_dir
+echo Expected directory for temporary files \(will be deleted\): $prestuff_dir
+
+# Define available programs for update
+if command -v git > /dev/null; then
+  echo command git is available, will update dataegret stuff directory by the one
+  cd $stuff_dir
+  git pull -v
+  cd `pwd`
+elif command -v unzip > /dev/null; then
+  echo command unzip is available, will unpack dataegret stuff directory by the one
+  stuff_url="https://github.com/dataegret/pg-utils/archive/master.zip"
+  echo Will be downloaded next file: $stuff_url
+  if command -v wget > /dev/null; then
+    echo command wget is available, will update dataegret stuff directory by the one
+    wget -cvt 5 -O $prestuff_dir/master.zip $stuff_url
+  #elif command -v fetch > /dev/null; then
+  #  echo command fetch is available, will update dataegret stuff directory by the one
+
+  elif command -v curl > /dev/null; then
+    echo command curl is available, will update dataegret stuff directory by the one
+    curl -svS -o $prestuff_dir/master.zip $stuff_url
+  else
+    echo commands wget, fetch or curl is not available, can not to update dataegret stuff directory
+  fi
+  echo Sync downloaded data into $stuff_dir 
+  unzip -uo master.zip -d $prestuff_dir
+  if command -v rsync > /dev/null; then
+    rsync -avr $prestuff_dir/pg-utils-master/* $stuff_dir/ 
+  elif command -v cp > /dev/null; then
+    cp -afvr $prestuff_dir/pg-utils-master/* $stuff_dir/ 
+  fi
+  echo Removing temporary files: $prestuff_dir/pg-utils-master $prestuff_dir/master.zip
+  rm -r $prestuff_dir/pg-utils-master $prestuff_dir/master.zip
+else
+  echo commands git or unzip are not available, can not to update dataegret stuff directory
+  exit 1
+fi
+
+exit 0