Add connect and concurrent tasks

- Removed livereload snippet, since connect now injects livereload
- Added modernizr and html-inspector since it'll be a little bit
  faster for slow connections to have them locally
- Modernizr build task now prefixes the modernizr classes with
  "supports-*", according to html-inspectors' conventions
- Removed open since connect can open as well
Merge branch 'connect' into develop