Update to use grunt 0.4.x

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

Jira-issue: WP-779