Wp 779 update to grunt 0.4

Add new task to wrap concatenated code, previous directives for that are
not supported with grunt 0.4. Add grunt modules to package.json.

Remember to switch to grunt 0.4 use:
$ npm uninstall -g grunt
$ npm install -g grunt-cli
$ npm install --save-dev # from webinos dir

Installation instructions on https://developer.webinos.org/ need to be updated as well.

Jira-issue: http://jira.webinos.org/browse/WP-779