Use aFarkas/webshim project for HTML5 placeholder and autofocus attributes.

Signed-off-by: Anurag Priyam <anurag08priyam@gmail.com>
Update gemspec: no example.config.yml.

Residual change from SHA: 4b91c4e1.

Signed-off-by: Anurag Priyam <anurag08priyam@gmail.com>
Use relative URLs.

Signed-off-by: Anurag Priyam <anurag08priyam@gmail.com>