locals scope stopped working with EJS

All local variables used to be scoped to `locals` but now that is no longer the case as `locals` is undefined in EJS templates rendered via _partial()_

e.g. the following now throws an error:

_parent template:_

```
<%- partial('user', {name: 'Aaron'}) ->
```

_user partial template:_

```
<h1>Hello, <%= locals.name %></h1>
```
