Add changelog entry for line boundary navigation fixes
Merge pull request #729 from peitschie/lb-changelog

Add changelog entry for line boundary navigation fixes
Allow multiple instances of the editor to be created in a single page

Mangle HTML ids in a predictable fashion in dialog widgets to ensure they
do not clash if multiple instances are loaded.
Split screen editing app

Creates two editor instances within a single web-page, and allows live
collaboration between them.

Key features:
* EASY TO USE (requires no additional setup to run)
* supports client disconnection
* simplistic latency simulation
fixup! Split screen editing app
fixup! Split screen editing app
fixup! Split screen editing app
fixup! Split screen editing app
fixup! Split screen editing app
fixup! Split screen editing app
fixup! Split screen editing app
fixup! Split screen editing app
fixup! Split screen editing app