add stop maintenance statement

Fix issue with the windows install script. (fixes #704)

Merge pull request #702 from 4D48/master

Update the changelog.

Enhance the windows installer. (fixes #638)

Update the npm package-lock files.

Finnish translation

Update the changelog.

Bump version to v2.3.0

Update nw-builder.

Update autoprefixer, postcss, uglify-es and uglify-js

Update the build script and dependencies.

Update sass to version 3.5.2

Update autoprefix, clean-css, coffee-script, postcss, uglify-js and uglify-es.

Make the install script executable.