partial grunt.js integration and utf8 BOM removed

My first intention was integrating the newest osgjs. After looking a bit in the code, i found it is to expensive. But then i tried grunt.js and have do some project files for gotzi. I mean:

- package.json for node.js. You can run "npm install" to install all this nice grunt-tools.
- grunt.js for grunt.

This is only half baked :) But you can use it as for a first start point. Sorry, i don't have time to do more. 

I've borrowed some parts of grunt.js file from cedricpinson/osgjs@f605a2c project.