Update CONTRIBUTING.md
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
Localisation updates from https://translatewiki.net.