rework event api
Merge branch 'master' into events-refactor
fix reporting of uncaught exceptions: chrome v35 only reports them correctly in the console when the message is smaller than around 238 characters.
improve docs.
move 'observable' module from conductance to sjs stdlib
sequence::each.track
docs
Merge branch 'master' into events-refactor

Conflicts:
	modules/sjs-lib-index.json
polymorphic event::wait
Merge branch 'master' into events-refactor

Conflicts:
	modules/sjs-lib-index.json
minor docs fix