mod_jk balancer manager

Hi!
thanx a lot for your balancer-manage.py script. In my fork I did the following:

* refactoring: to get working on redhat 6.5
* add -H(host) and -p(port) args
* added manage-jk-balancer.py
* renamed balancer-manage.py to manage-proxy-balancer.py
* updated the readme

Please review the changes, If you like them, here is the pull request

Kind regards
Vlad