Added etcd_functions to dockerfiles/etcd
Fixed so that etcd daemon sends correct peer information
Changed back references in replace expressions to use $1 instead of \1
Added function in etcd_functions for changing IP of records in /etc/hosts
Added support for using etcdctl instead of curl in etcd_functions
Make sure db container waits for etcd to be ready before trying to register IP
Removed curl from mysql image, and instead added etcdctl client
Setting environment variable ETCDCTL_PEERS in etcd_functions so that etcdctl can be used without --peers option
Added supervisord to phpfpm container and add watchdog for db's ip using etcd
Added supervisord to nginx container and add watchdog for phpfpm's ip using etcd
Added volumes/etcd to .gitignore