Typescript: "A class must be declared after its base class" on classes in different directories

[saschanaz]

TypeScript Version: master branch

Repro

1. Create a new JavaScript->Windows->Universal->Blank App project
2. Add directories and empty files as following:

```
(App name)
|>sources
| |>cats
| | |>elephants
| | | foo.ts
| | bar.ts

sources/cats/elephants/foo.ts
sources/cats/bar.ts
```

1. Write codes as following:

``` ts
// In sources/cats/elephants/foo.ts:
class Foo extends Bar {
}

// In sources/cats/bar.ts:
class Bar {
}
```

1. Open project properties and set "Combine JavaScript output into file" to "js/app.js"
2. Unload project
3. Reload project

Expected behavior:

Compiler should automatically make a proper order for the classes

Actual behavior:

class Foo extends Bar {
//                ~~~
//                A class must be declared after its base class.
}

Workaround:

Rename "foo.ts" to "a.ts".

[RyanCavanaugh]

The compiler doesn't figure out what the "right" order of files is based on class dependencies or anything else. The usual methods are available: have a _reference.ts, use /// <reference directives, or use a module loader (if applicable)

[saschanaz]

Thanks! I would be happier if the error message told me the tip.