…rvice by default
I decided to gloss over the details of how a single base URL is selected from a collection when generating an asset's path, as the internal behavior of UrlPackage is just that.
…refixing Versioned path prefixes are useful for CDN's that do not support cache-busting via query strings. This seemed small enough to add as a tip, although it might be better expanded into a cookbook article (and this tip reduced to a "see cookbook" link). Also added a note about required escaping of percentage signs in the option value.
…t be required for 2.1
…me in entity choice - see #683