rebalance_ignore_missing is missing from documentation

```

The command directive in the mogilefsd.conf "rebalance_ignore_missing" is not 
in the documentation.  

An explanation of what the option does, as well as how to use it, is needed.

-Martin Bogomolni
PBworks


```

Original issue reported on code.google.com by `martinb...@gmail.com` on 9 Jul 2012 at 6:33
