[TASK] Add grunt task to update components managed via bower

This task is used to keep the installed npm and Bower components up to date.

Just run: "$ grunt update" on the command line.

As a first example, RequireJS is now loaded via Bower and will
be automatically copied to "typo3/sysext/core/Resources/Public/JavaScript/Contrib/requirejs/"
so that it also can be loaded from the PageRenderer.

See http://wiki.typo3.org/Grunt_Bower for more documentation.

Resolves: #66061
Releases: master

Change-Id: I8422d77159ddae9d8b18170cabeca5e9e8168635
Reviewed-on: http://review.typo3.org/38259


Reviewed-by: Benjamin Mack <benni@typo3.org>
Tested-by: Benjamin Mack <benni@typo3.org>
Reviewed-by: Wouter Wolters <typo3@wouterwolters.nl>
Tested-by: Wouter Wolters <typo3@wouterwolters.nl>
Reviewed-by: Anja Leichsenring <aleichsenring@ab-softlab.de>
Tested-by: Anja Leichsenring <aleichsenring@ab-softlab.de>
Reviewed-by: Andreas Fernandez <andreas.fernandez@aspedia.de>
Tested-by: Andreas Fernandez <andreas.fernandez@aspedia.de>