No config

closes #2 

```bash
$ python leadbutt.py
ERROR: Must either run next to config.yaml or specify a config file.

Usage:
  leadbutt [options]

Options:
  -h --help                   Show this screen.
  -c FILE --config-file=FILE  Path to a YAML configuration file [default: config.yaml].
  -p INT --period INT         Period length, in minutes (default: 1)
  -n INT                      Number of data points to try to get (default: 5)
  -v                          Verbose
```