Work on Gruntfile.js (#3436)

* removed unused jQuery plugins

* Remove unused node/grunt package

* Work on Gruntfile.js

Add new publish task (admin only)
Reorganize

* Fix #3435 - error when js can't load locale file

* Fix #3438 - check for some GithubExceptions in issue submitter

* Fix network images #3431

* Revert "Fix network images #3431"

This reverts commit 74510230ade80f339054e3ee9fcafcab3dd08846.

* Fix gruntfile.js syntax, simplify the static handler of messages.json