Change whitespace in styleguide JS
Update `robots.txt` file

* Update the URL to `www.robotstxt.org`.
* Add comment making it clear to everyone that the directives from
  the `robots.txt` file allow all content on the site to be crawled.
* Add `Disallow:` directive.

Ref: https://github.com/h5bp/html5-boilerplate/commit/4e5f438e1ea0d7e39179ba5cf799a8d326ba7cc3
Merge pull request #81 from alrra/update-robotstxt

Update `robots.txt` file
Update components.css

Remove hgroup from html5 display definitions, cause hgroup is deprecated and deleted from the w3c specs. even if it is still listed in the WHATWG. http://www.w3.org/wiki/HTML/Elements/hgroup
Close GH-75: Add basic aria roles. Fixes #53
Style guide: improve image alt tags
Style guide: remove unnecessary meta prop
styleguide - grammar
Remove license info from `404.html`

The license information is already provided in the `LICENSE` file.
Update _normalize.scss | remove deprecated hgroup

Remove hgroup from html5 display definitions, cause hgroup is deprecated and deleted from the w3c specs. even if it is still listed in the WHATWG. http://www.w3.org/wiki/HTML/Elements/hgroup
Comments for components.scss
Merge pull request #87 from alrra/remove-cc-header-from-404

Remove license info from `404.html`
Expand contribution section to cover the site
Merge pull request #83 from webdesignberlin/patch-1

Update components.css | remove deprecated hgroup
Mark package as private

Ref: https://www.npmjs.org/doc/json.html#private
Merge pull request #89 from alrra/update-package-json

Mark package as private
Merge remote-tracking branch 'google/master'
Revert "Removed “placeholder--medium.png” as it’s not used anywhere."

This reverts commit 201d00b292bd92418dd6811f811859a6c861dcae.