A way to specify options for all scripts in a package

Possibility:

```json
{
"*": {
"dependencies": [
"bootstrap"
],
"packageLocks": [
"yarn.lock"
]
}
}
```

`*` is unlikely to collide with a real script name, but we should probably support an escaping scheme anyway, e.g. `\*` means the script literally called `*`.