add a gsll command

if you're in a parent folder that has a bunch of sub-repos you can run `gsll` and get the status of any modifications that have not been committed.

```sh
~/Projects/directiv
λ : gsll
./core-handler
?? index.js

./core-map
 M index.js
 M package.json

./core-reduce
 M index.js

./data-hyper-bind
 M index.js

./test-benchmark
?? index.js
?? package.json
```