Proposal: more declarative/condensed sort options

[webketje]

The combined sort options aren't that semantically meaningful. Furthermore, it doesn't make that much sense to use some of them together (custom sortBy function with the others)

To do:

• add @deprecated to the reverse,sortBy, and sortOrder options
• adapt Readme examples
• adapt tests
• implement sort with type signature:

  /** @param {String|Function} sort */

  where sort:'key' or sort:'key:order' or sort: Function, where order is one of'asc'|'desc' (which map to reverse: false|true)