Mark 4.0 release candidate 2

Tag 4.0 release candidate 1

Mark release 3.22

Merge branch 'master' into v4

Conflicts:
	addon/comment/continuecomment.js
	lib/codemirror.js
        mode/puppet/puppet.js

Drop setLine and removeLine from the API

Mark release 3.21

Mark release 3.20

Mark release 3.19.0

Mark release 3.18

Mark release 3.17