Show tags in source list

I find it useful to show also the tags in the source list:

![show_sources_tags](https://f.cloud.github.com/assets/497880/659535/3ca93f42-d6a1-11e2-934d-2f8724734754.png)

The only problem I have is to update tags after a I edit the source. In this case I only show "..." as red tag. This is not perfect, but better then nothing I think. :)

I hope you like it to...