bindToController should support "scope" syntax/features

currently, if you want to use "bindToController", you have to do this:

```
bindToController: true,
scope: {
message: "@"
}
```

to simplify, bindToController should support the scope syntax and automatically set to true:

```
bindToController: {
message: "@"
}
```

This helps explain what is actually happening and simplifies your code so it should be a simple win/win.
