Compress JSON, CSS and Javascript responses

api/category.go

api/entry.go

api/feed.go

api/icon.go

api/subscription.go

api/user.go

fever/fever.go

http/response/json/json.go

http/response/response.go

middleware/fever.go

ui/entry_scraper.go

ui/entry_toggle_bookmark.go

ui/entry_update_status.go

ui/static_manifest.go