Updating yoeman config to reflect changes with handlebars
Added Chocolate Chip UI as a bower dependency

- Seems like a good choice as it supports Android, iOS and Windows 8
Changed grunt to dump css files into the styles folder

- the generator had SASS output pointed to a tmp folder so none of the
  css files showed up in the build until you built the app
- removed the main.css from the repo, we shouldn't commit css files
- added a gitignore entry for any .css files in the styles folder