fixed wrong `this` within modules fixes #97

Fixed it ^^.

But I couldn't adjust the tests since the browsertests didn't run. After running `node build` it said:

```
ERROR in ./~/library2/lib/main.js
Module not found: Error: Cannot resolve module raw in c:\Users\jhnns\dev\webpack\test\browsertest\node_modules\library2\lib.
 @ ./~/library2/lib/main.js 9:2-24:4 15:17-35
```