fix crash if disconnect happens for sessions that have messages queued
remember user session because it can be gone when finalHandler is called
Update CONTRIBUTING.md
changelog, package file and fix for redo
Merge pull request #2092 from webzwo0i/fix-crash-with-queued-messages

Fix crash with queued messages
Polish the styles of our docs a little
Merge pull request #2117 from ether/doc/asset-css-suit-up

Polish the styles of our docs a little
fix error on focus remove from import/export
Fix timeslider export dropdown
Create a customizable timeslider toolbar
Fix redo toolbar command, again.
Update docs
Merge pull request #2120 from ether/fix/timeslider-editbar

Add a customizable toolbar for timeslider
docs: update api version
Merge branch 'release/1.4.0'
Merge branch 'master' into develop
Update README.md

Added support for node v0.11 in the installation description
Merge pull request #2123 from ether/master

Update README.md
Toolbar: Fix timeslider button

Wouldn't play nice with url params in document.location
fixes #2124
Merge pull request #2126 from ether/fix/toolbar-timeslider-button

Toolbar: Fix timeslider button