Changes for version 0.17
- . Added test for circular reference fixed in 0.16 . Added more support for command queueing. Destructors can now be queued until program exit, repl shutdown or until the next command is executed, whichever comes first.
- Actually call the callback set up by ->__on_destroy . Added a test that the __on_destroy callbacks get called
use a 7bit safe json2.js for MozRepl/JS serialization