Keep you ETS tables safe!
ets_mgr is simple gen_server that wraps some of the ETS interface. When tables are constructed through the manager API it will automatically declare itself as the heir to that table. If your calling process ever dies your data is safe and can be retrieved when your process is restarted.
Inspired by http://steve.vinoski.net/blog/2011/03/23/dont-lose-your-ets-tables/
