Compress formatting options

The current output of compress is something

```
input  size: 186 KB
output size: 34 KB
compression ratio: 5.389352
```

Having an option to have the input and output sizes in full bytes. The CSV in #85 and this shouldn't be mutually exclusive.

An example output would be: 
```
input  size: 186,103
output size: 34,293
compression ratio: 5.389352
```