Merge pull request #6164 from barrykooij/master

Removed the 'delete_users' case.
Grunt dev
remove check to make sure order is complete before downloading. fixes #6166
now is official o/
Add support for PoEdit Headers
Arrange devDepedencies alphabetically and updated

Updated grunt-wp-i18n especially to support PoEdit Headers and optionally grunt-shell too.
No support for PoEdit and updated packages.json
Don't load simplify javascript when gateway isn't available
Merge pull request #6167 from BFTrick/iss-6166

Fix for 6166
Merge pull request #6171 from maxrice/fix-simplify-js-load

Don't load simplify javascript when simplify gateway isn't available
Merge pull request #6169 from axistools/makepot

Makepot now Supports PoEdit Header