Added Sass styling and fixed Grunt copy:app

Converted to Sass styling and fixed Gruntfile's copy:app which wasn't ignoring .scss files.
I had to change this line to:  sourcemap: false
in order to get grunt init to not fail with this error:
    Warning: OptionParser::InvalidOption: invalid option: --sourcemap=none
      Use --trace for backtrace. Use --force to continue.