fs service - support content type of css
fs service - support content type of css

- fix only css files
- fix conten-type: text/css

MaxKarel/engine,tomatell/engine,peterkacinec/registries,tomatell/engine,peterkacinec/engine,MaxKarel/engine,peterkacinec/registries,peterkacinec/engine,sosik/registries,peterkacinec/registries,tomatell/engine,MaxKarel/engine,sosik/registries,peterkacinec/engine,sosik/registries