Also, correct the change logs to be much more consistent between each
other and ensure the ospec and stream change logs are linked to from
Mithril's primary change log.
* Rewrite stream
* Rename HALT to SKIP
* Rename HALT to SKIP
* Remove valueOf and toString
* Update docs for HALT to SKIP
* Rename halt to skip in test
* Add test for combining nested streams atomically
* Update change-log.md
* Test basic SKIP
* Add deprecated HALT
* Combine continues with ended streams
* Fix fantasy-land/of to match spec
* Don't use arrow function
* Improve scan description
* Fix merge artifact
