[WIP] Feature/bundle assets

should fully resolve case 2,3 on #38
![asset_js_css](https://f.cloud.github.com/assets/1011712/463688/910de7a6-b58e-11e2-9ebf-32ab721dbf8b.png)

i hade to move the asset reader...

there is also a todo about the`{% xxx`. i didtnt find a better way to filter the psi pattern. looks some twigtokens are not probably implemented.
is that working in all cases?