Add minify options

see also: #105

default:

```
$ time styledocco path/to/src --include foo.js --include --bar.js
142.17s user 0.19s system 101% cpu 1.524 total
```

Use `--no-minify`:

```
$ time styledocco path/to/src --no-minify --include foo.js --include --bar.js
1.33s user 0.19s system 101% cpu 1.501 total
```