Update files to reflect recent changes in H5BP

Ref: h5bp/html5boilerplate.com#107
Update to Grunt 0.4.x

Ref: h5bp/html5boilerplate.com#107
Make `/logo.svg` discoverable by search engines

See also: http://googlewebmastercentral.blogspot.ro/2013/05/using-schemaorg-markup-for-organization.html

Ref h5bp/html5boilerplate.com#107
Close h5bp/html5boilerplate.com#105
Remove dimensions from `logo.svg`

Make SVG image expand to fill all the available
space if the user doesn't specify its dimensions.
Update `index.html`

* Remove link to the `node build script` repository as the project is no
  longer maintained.

* Change `touch-device icons` to `touch-device icon` as HTML5Boilerplate
  now includes only one apple-touch-icon:
  https://github.com/h5bp/html5-boilerplate/commit/71ca9fb7a06bfcd2359c924ca261d41d1dd03e8d.