[WIP] Rework grunt tasks

This pull-request will rework the grunt tasks and prepare the repository for the new release process. 

Todo's:
- [x] Update dependencies to higher version
- [ ] Rework current grunt tasks
- [ ] Create tasks for new release process to dist folder and dist.zip
- [x] Clean javascript/css against the jshint, jscs, css lint rules
- [x] Add version to banner of dist files
- [ ] Integrate version property in datepicker object
- [ ] Add grunt task to update version in datepicker object
Fix and removed the < & > around the url