twig file index dont provides all files, so build a custom one on bundle...

i did some rework on twig indexing for #51. looks like `FileTypeIndex` dont provides all twig files. also did some relative path optimization

![twig](https://f.cloud.github.com/assets/1011712/492808/6bf41284-baf1-11e2-9fe4-f03aa040acd0.png)