Closes #298 - Enable MiniFluo administration from fluo admin script

Pull request for #298
Could also check for empty table name here.  I tried doing the following and it failed.

 1. cp conf/examples/* conf/
 2. vim conf/fluo.properties
 3. uncomment io.fluo.mini.start.accumulo=true
 4. ./bin/fluo mini start

It failed because Fluo tried to create a table w/ an empty name because by default the following is in fluo.properties

```
io.fluo.admin.accumulo.table=
```