simple mime type support

Hi all,
@tombh created a very simple commit to add cloudfuse mime support compatible with latest redbo version.

Mime support if **very very important** when we have files that need cdn support. Almost every file must have a mime type defined so that browsers can handle those files.

This is a very simple and useful path that adds correct header to each file without additional external lib dependencies.

Is works as expected.
Feel free to merge it.

Thanks again to @tombh 

best,