chore(grunt): add watch:demoSite task
chore(demoSite): update site template

- Move additional css and js into a specific "resources" directory
- Improve meta-tag "description"
- Open external links in new windows
- Add "introduction" section
- Add "download" button
chore(demoSite): add installation instructions and font-awesome icons
chore(grunt): add compress task
chore(demoSite): add license information
docs(readme): add license information
chore(grunt): add license information at the top of built files