Update riak-admin and riak man pages

The riak-admin and riak man pages were horrible out of date. The options were to update them, or delete them. Clearly, the former was the chosen path.

To test, just run man against the gz files.

```
man ./doc/man/man1/riak-admin.1.gz
man ./doc/man/man1/riak.1.gz
```

#524 opened the door

- [ ] Also merge into EE