Remove minify processes

When the file size of CSS and JavaScript is large, minify processes are very slow.

In my project: (142.17s)

```
$ time styledocco path/to/src --include foo.js --include --bar.js
142.17s user 0.19s system 101% cpu 1.524 total
```

applied this patch: (1.35s)

```
$ time styledocco path/to/src --include foo.js --include --bar.js
1.35s user 0.19s system 101% cpu 1.524 total
```