Console backend for lager is not _handler.

Minor typo/oversight in lager config. Results in these log messages:

```
2013-09-12 15:41:00.700 [error] <0.47.0>@lager_handler_watcher:105 Lager failed to install handler lager_console_handler into lager_event, retrying later : {'EXIT',
                                                                                          {undef,
                                                                                           [{lager_console_handler,
                                                                                             init,
                                                                                             [info],
                                                                                             []},
                                                                                            {gen_event,
                                                                                             server_add_handler,
                                                                                             4,
                                                                                             [{file,
                                                                                               "gen_event.erl"},
                                                                                              {line,
                                                                                               418}]},
                                                                                            {gen_event,
                                                                                             handle_msg,
                                                                                             5,
                                                                                             [{file,
                                                                                               "gen_event.erl"},
                                                                                              {line,
                                                                                               284}]},
                                                                                            {proc_lib,
                                                                                             init_p_do_apply,
                                                                                             3,
                                                                                             [{file,
                                                                                               "proc_lib.erl"},
                                                                                              {line,
                                                                                               239}]}]}}
```