Template subfolder 

I can't load a template in a subfolder.

When I use this:

```
  $rainTpl->draw("work/overview");
```

It does this

```
  C:\wamp\www\ravenproj/storage/themes/minimal/overview.html
```

but when changing to

```
  $rainTpl->draw("work\overview");
```

then it works.. but how can I let it work with forward slashes

```
  C:\wamp\www\ravenproj/storage/themes/minimal/work\overview.html
```
